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#51 (permalink) | |
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Opeler
Join Date: May 2006
Location: Hudsonville, Michigan, USA
Posts: 1,794
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(I think the diagram shows slightly different set up in '73) Anyway, I got it down. What I'm going to do with the "loose end" under the car I don't know. PO had it just sitting there too. I sure hope this solves my gassyness (the burritos don't help either). PS had to search to find that the nuts to release the tire/jack bracket that sits on the shelf on passenger side (has to come out to get shelf out) were in the rear wheel well, above the tire, on the outside of the car (for the benefit of those that are doing this in the future) the heads for these bolts are smooth like rivets.
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"Being ignorant is not so much a shame, as being unwilling to learn." Benjamin Franklin |
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#52 (permalink) |
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Opeler
Join Date: Jan 2007
Location: Oakville, Ontario, Canada
Posts: 94
Real Name: Harold
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Vent lines replaced, still some odor?
I replaced my vent lines with fuel line as well. I didn't have to remove the tire bracket mount on the passenger to get the shelf out.
The gas smell is significantly less now, but not completely gone. Any other suggestions Does one have to change any other components back there, like the rubber section between the tank and the filler neck or a fuel level sending unit seal? I think my charcoal canister in the front has a leak, looks like rust got to it, would that make a difference?Thanks, Harold. |
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#53 (permalink) | |
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Member
Join Date: Mar 2002
Location: Fallbrook. CA
Posts: 704
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one "TEE" needs to be the right one
The one "Tee" off the filler neck has a small pin hole opening on one side and a larger hole on the other. There is a design reason that small hole has to be mounted towards the neck This is to lessen the amount of gas that will flow down the line when filling the tank, and lessen the vapors that go into the compartment. If anyone wants the tech tip from Jim Petzold with instructions on how to do the repair and an easy to understand illustration too I can send them copies. |
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#55 (permalink) |
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Member
Join Date: Mar 2003
Location: Wisconsin
Posts: 605
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I need that tech. sheet and explanation too.
The info. that I have shows the small opening in the tee valve, NOT in the line to the filler cap but in the tee at the line thta goes to the charcoal canister to reduce chance of gas going that way. What size does this opening have to be? Only vapor moves through it. Can any old tee be used, just put a press fit metal tube in that end of the tee to limit that particular orifice size? |
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#56 (permalink) |
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Opeler
Join Date: Aug 2004
Location: Planet Earth
Posts: 502
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Answers
"Does one have to change any other components back there, like the rubber section between the tank and the filler neck or a fuel level sending unit seal? I think my charcoal canister in the front has a leak, looks like rust got to it, would that make a difference?"
In answer to your questions: (1) Yes, there are other components involved, and it's a good idea in general, to just go ahead and replace the wide hose between the tank and filler neck tube, and to also replace the gas tank sender gasket, at the same time as you have done the labor to access the hoses off the fuel tank. I have experienced an ongoing fuel smell, even after replacing the vent hoses and clamping them off, which wasn't stopped until I took those extra steps. In many cases, these are 34-38 year-old original components that are asked to prevent a possible explosion! Certainly it's worth an extra $20 for the parts, to eliminate that scenario. (2) It's a good idea to also connect the carbon cannister line to the tank. It helps to reduce tank pressure buildup, by providing a filtered outlet for fumes to be vented out. (Also understand, that when you rely on a tech tip, that you need to verify that the writer has actually performed the procedure and has monitored its longer term results on an actual GT. Badly written tips, which have been observed in the past, can invite complications and even injury. Variables can also include profit motives, publication deadlines, the degree (or lack) of social responsibility of the writer, and individual ego). Last edited by Anonymous D; 05-12-2007 at 11:30 PM. |
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#57 (permalink) |
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Opeler
Join Date: Jan 2007
Location: NYC
Posts: 24
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Well I want to drain my fuel tank but i can't seem to unscrew the plug in the bottom of the tank i have tried all types of sprays to loosen it but nothing has worked. Can anyone suggest another way to drain the tank i have 8 year old gas in there now that i want to get rid of. Also i noticed as well that the vent lines on the tank have fallen apart can someone recomend a good replacement hos that will work as a recplacement?
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#58 (permalink) |
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6,000 Post Club
Join Date: Aug 2002
Location: Imperial Beach, CA South of San Diego
Posts: 6,054
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You can drain the tank by removing the fuel line where it attaches to the metal tube coming out of the tank. I would put a short piece of hose over the metal tube, so you can squeeze it closed or plug it to stop the fuel running out if needed. The replacment vent line hose has been discused numerous times on the site, do a search for fuel tank vent lines and you'll find a lot of posts on it, also make sure you put the "T" fitting back in the correct position when you replace the lines, there are different size holes in them for a reason. HTH.
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Ron 72 GT 3.4L V-6/T-5/ZF posi - almost done - Just need AC installed. ![]() 75 Chevy monza 5.7L/TH350/Auburn 3.08 posi - Next |
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#59 (permalink) |
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Member
Join Date: Aug 2003
Location: San Francisco Bay Area
Posts: 931
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I've found no good way to dispose of old fuel once it's drained from a fuel tank. The 3 times I've had this issue, I've left it in the tank and followed the following procedure;
No Muss, No Fuss. |
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#61 (permalink) | |
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1000 Post Club
Join Date: Dec 2002
Location: League City Texas
Posts: 1,117
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Texas Opel Preservation Society |
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#62 (permalink) |
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Opeler
Join Date: Jan 2007
Location: NYC
Posts: 24
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OK so today i wanted to drain my gas tank so i took out the spare tire rack just to make sure it wasn't rotted to bad. AND as most of you also saw, i saw that the vent lines where broken. Does anyone have a diagram of what all of the ports on the tank are and where the hoses go. I think i have it all down except there is one hose in the back right (from inside the cabin) that goes down (it seems like under the car)-->what does this line do and where does it go. Also on the T fitting that goes to where you put the fuel in i am unsure about where one of the lines goes. I know one goes to another T fitting but what about the other one? I do have a service book for my 1973 opel and i also have a Chiltons book niether of them have helped me with these questions maybe some of you can. Hope that wasn't to confusing. Also i replaced the line with low pressure hose from my local car quest store it was cheap at only 1.50 a foot.
Also good news i got the engine running today, well 3 out of 4 cylinders. Tomorrow i change the spark plugs and a few other things. |
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#65 (permalink) | |
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Army Opeler
Join Date: Mar 2005
Location: Jonesboro, GA
Posts: 89
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#66 (permalink) |
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Opeler
Join Date: May 2006
Location: Hudsonville, Michigan, USA
Posts: 1,794
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Those are water drains from the cabin vent system, from the vents on the outside above the rear window, that whole thing. They go through the bottom of the car and have "duck bill" rubber caps so water can get out but fumes/ junk can't get back up in there. I still have issues, either the T fitting with the smaller opening is in wrong or the filler neck is vapory....almost there.
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"Being ignorant is not so much a shame, as being unwilling to learn." Benjamin Franklin |
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#68 (permalink) |
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Opeler
Join Date: May 2006
Location: Hudsonville, Michigan, USA
Posts: 1,794
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Hudsonville is on the west side, near Grand Rapids. Michigan Opel people need a gathering next year.
__________________
"Being ignorant is not so much a shame, as being unwilling to learn." Benjamin Franklin |
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#69 (permalink) | ||
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'72 Opel GT (Sara)
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New gas cap, vacuum in gas tank, vent line full of fuel
I've had an interesting issue arise that resulted from an odd sequence of events so I thought I would post them here as I think they relate to the vent line issues discussed in this thread. Also, this may help someone else in the future because it is rather odd (to me anyway)...
My car started bucking and stalling recently for no apparent reason. After much discussion and investigation, including test driving under various conditions, it turns out that a vacuum is forming in my gas tank. Once the tank gets down to about half full, the problem starts and gets worse as the tank is drained. The only thing I changed on the car was to put on a nice new gas cap. It would appear that this new gas cap has revealed an issue with my vent lines. The new gas cap is forming such a nice seal compared to my old POS gas cap, that a vacuum is forming inside the tank (that is my current working theory). What clued me in to this was the fact that a loud hiss of air is released from the tank when the new gas cap is removed which is something that never happened with the old gas cap. In addition, while replacing a burnt out side marker bulb on the driver side, I noticed that the driver side vent tube is full of fuel! So, on to the questions...
I know the subject of the vent lines has been discussed ad nauseam but I thought this particular sequence of events involving the gas cap and the vacuum situation in the tank might be of interest. I also want to know if I should do more than just drain the vent line that is full of fuel, stop filling the tank all the way up, and move on. Comments and suggestions appreciated! Thanks, Matt
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'72 Opel GT (Fireglow Orange) Third Owner, Purchased in 1986 Current Status: Fully Restored Major Mods: Weber Carb, High Compression Pistons, Electronic Ignition, XM Radio / CD, ADDCO Front / Rear Anti-Sway-Bars, Custom CAI, Sprint Manifold Restoration Thread Comments Thread Other Cars: '09 Pontiac G8 GT (Panther Black) '06 Pontiac Solstice (Envious Green) '99 Oldsmobile Intrigue GLS (Black Onyx) |
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#70 (permalink) |
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6,000 Post Club
Join Date: Aug 2002
Location: Imperial Beach, CA South of San Diego
Posts: 6,054
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That's interesting, and I've heard of it happening before. I'm trying to think if the original GT gas cap is a non-vented or vented type. After looking at Willit?s cap it appears to be a vented type, but I'm not sure. So that begs the question, do you have an original cap or after market, and if aftermarket, is it a vented or non-vented? Looking at the routing of the vent lines, and presuming all is functional, the flow of vacuum presumably would be, starting at the intake manifold/carb, to the charcoal cannister, back to the gas tank, through the tank vent lines and in from the gas cap. Again presuming, equal vacuum in the tank and vent lines, the fuel sloshed in to the vent lines down low at the tank would eventually drain back in to the tank, because they are mounted under the floor of the rear window shelf. So it says in the fine print. The tech tip that Jim M. of USA Opel has is not loaded on the site, he infers he has copies he can send out. HTH.
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Ron 72 GT 3.4L V-6/T-5/ZF posi - almost done - Just need AC installed. ![]() 75 Chevy monza 5.7L/TH350/Auburn 3.08 posi - Next |
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#71 (permalink) | |
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'72 Opel GT (Sara)
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Thanks! Matt
__________________
'72 Opel GT (Fireglow Orange) Third Owner, Purchased in 1986 Current Status: Fully Restored Major Mods: Weber Carb, High Compression Pistons, Electronic Ignition, XM Radio / CD, ADDCO Front / Rear Anti-Sway-Bars, Custom CAI, Sprint Manifold Restoration Thread Comments Thread Other Cars: '09 Pontiac G8 GT (Panther Black) '06 Pontiac Solstice (Envious Green) '99 Oldsmobile Intrigue GLS (Black Onyx) |
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#72 (permalink) |
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UngerDog
Join Date: May 2004
Location: Pleasanton, CA
Posts: 767
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I tested 2 of my original gas caps and they both seem to be vented. Your cap must not be vented by the fact that there is a vacuum being created. I would think the vent lines would help to alleviate any vacuum. However, if they were blocked you would get the symptoms you are describing with a non-vented cap. And, since you have fuel in the vent line, it does make sense that you have an overfill situation. I would check the vapor cannister and see if it has fuel in it also. I'm not sure, but I can imagine that if fuel got it there it would block up the whole system.
Jerry |
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#74 (permalink) |
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Über OpelGT.com Moderator
Join Date: Mar 2002
Location: Calgary, Alberta, Canada
Posts: 4,087
Real Name: Keith Wilford
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The OEM Opel gas caps are non-vented, to minimize gasoline vapour emissions, hence the evaporative system (vent lines, charcoal cannister and connection to the carb throat). If your vent lines are plugged, it would certainly cause the tank to pull a vacuum, and starve the fuel pump and carb for gas. I wouldn't have thought that gasoline in the vent lines would block the lines enough to pull the tank into a vacuum, but perhaps. As ungerman has asked, what are you doing with the vent lines if your cannister is removed?
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Keith Wilford working on my '71 GT and '75 SportWagon |
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