New Fuel Pump Advice Needed

[grslightng02]

I'm working on getting my 71 GT back into running shape for a daily driver. I had problems with the car stalling at idle speed and figure this all needs to be taken care of anyway. The following is on my list to be done. Remove and clean tank and sock filter, replace venting lines, replace fuel lines, replace fuel filter, and possibly a new weber instead of solex, replace all vacuum hose lines, check timing, dwell etc.

I'm considering buying and installing a new fuel pump but I've never done something like this. Is this complex and I should let mechanic do it? or is it a matter of taking the old one off, bolting in a new one and replacing fuel lines?

Thanks Neil

[GTJIM]

Yes! You can ... as the Opel motor is a very simple motor with the fuel pump located on the outside of the front cover.

Just need to know that there is suposed to be a thickish composition spacer with a paper gasket each side of it between the fuel pump and the front cover where it bolts on. The rest is pretty straight-forward - just see if you can find an 'old-timer' real mechanic retired somewhere near you - he can probably help with good advice!

See here: http://www.opelgt.com/forums/fuel-pu...tallation.html

There are several other Threads which show up if you use "fuel pump spacer" in Search

[grslightng02]

Thanks for the advice Jim. I'll have to saw the connector hose between tank and filler neck in order to remove tank and just order a new hose. Next I'll be flushing the tank out with solvent and cleaning it.

I've heard the sock filter in the tank should be removed (for good?) and should I install a secondary clear fuel filter under the tank?

Thanks, Neil

[namba209]

Originally Posted by grslightng02 I'll have to saw the connector hose between tank and filler neck in order to remove tank and just order a new hose. Next I'll be flushing the tank out with solvent and cleaning it. I've heard the sock filter in the tank should be removed (for good?) and should I install a secondary clear fuel filter under the tank? Thanks, Neil

Saw the hose? If you're talking about the filler neck hose, there's just a couple of clamps holding it to the filler neck and tank. Once you loosen the clamps it should slide up or down and that's it. Not a bad plan to get a new hose from OGTS though, I thought mine was O.K. and after the restoration on Willit?, the old hose I thought was good, had cracked inside and leaked fuel, inside the car. Removing the sock is a good idea also, but do replace it with a clear filter outside and close to the tank. With a clear filter, you'll be able to see if it is gunked up.

[markandson]

Originally Posted by grslightng02 Thanks for the advice Jim. I'll have to saw the connector hose between tank and filler neck in order to remove tank and just order a new hose. Next I'll be flushing the tank out with solvent and cleaning it. I've heard the sock filter in the tank should be removed (for good?) and should I install a secondary clear fuel filter under the tank? Thanks, Neil

Instead of sawing the hose you can use a razor knife and slice it at one end almost all the way through, then stick and small screwdriver in between the tube and the hose and break it the rest of the way through. If you do this be careful not to cut into the metal or bend it with the prying motion to avoid possible leaks when the new hose it put on. I know exactly why you say it needs to be coaxed off in some way, mine hose was hard as a rock (no comments please) and stuck to the filler neck and tank also.

[grslightng02]

Thanks Markandson

Any suggestions on permanently removing the sock filter and installing a secondary filter under the tank?

[GTJIM]

The filter sock does need removal and putting a filter near the tank catches any rust flakes or other bits and pieces before they get to the fuel pump where they would jam the pump valves open and stop them working, either in the original fuel pump or an added electric fuel pump.
It is a good idea to also remove the small filter at the carb fuel inlet and add a 2nd plastic filter in-line just before the carb too.

For sock removal see here: http://www.opelgt.com/forums/fuel-ta...tank-sock.html

A search for "gas tank sock" and/or "fuel tank sock" should show up a few more Threads

[Opel GT007]

HI guys
sort of new to the Opel world
I just picked up a 73, If I pour gas directly into
the weber carb it runs fine for a few...
but Im not getting fuel from the tank. I was going to blow
thru the lines first, but may be looking at installing a new
fuel pump.
Its a project car, but learning on this car as I go along.
The ignition switch also works speratically, when you go
to start it. Ill be looking at that next.
thanks in advance all.

[tomking]

Do a search for fuel pump and also one for fuel tank sock. It sounds like the filter sock in the tank is plugged. A common problem which most rectify by removing it and just going with a filter before the pump.

[MICAH1]

........... but have you checked the filter/strainer in the weber carb???

[namba209]

The previous posts have already covered the most common reasons for the fuel problem. I'll address the ignition switch. first off, almost all the circuits go through the switch and after years of operation, the contacts do get pitted. A couple of soltions for both the "start" side and the "on" side of the switch is to install an "OttoStart" relay from "tekenaar", a member on the site, to the starterer and an additional 40 amp relay on the run/on side of the switch. Also www.opelgtsource.com will rebuild your switch. With these three modifications, your ignition switch will last almost forever. HTH.

[Opel GT007]

thanks guys for the tips
I was going to blow air thru the lines too first and see if
it was plugged, but will probably just pull out the sender as
mentioned and see if its clogged back there. Ive had that happen
on other cars that sat for yrs.
Is it a big job getting the sender out ? I havent looked that
closely yet and the cars not here, its at my work.
Also will look into the ignition switch too this week, thanks.
Ill keep you posted

[jmbinjax]

The sender and fuel supply are in two different locations. Assuming you're talking about a GT, the fuel supply is under the rear of the vehicle and the sender in located on the top of the tank and you have to remove the spare tire carrier to access it. The sock referred to previously is located where the fuel supply is. Depending on how corroded the connection is depends on the degree of difficulty. Once removed you may decide to replace it with a new supply line. Opel GT Source has a kit that includes what you need.

[Opel GT007]

Im actually getting ready to attack the same problem
my question is can you remove the sending unit assembly
and sock with the tank still in the car ?
and if not, whats involved in removing the gas tank ?
does it drop out from below or another way ?
Attempting to unblock old fuel lines this weekend on a
car thats sat for about 10 yrs.

[namba209]

Yes to both. Otto (tekenaar) has a thread on how to remove the sock from under the car, use the search button and you'll find it. IDK why you would want to remove the sender, unless it's bad. The fuel tank is removed from inside the car. The spare tire package shelf has to come out, along with the vertical braces and tire jack hold down. the brace on the passenger side has bolts that are accessible from the rear wheel well. They're probably hiding under the tar coating. once the shelf is removed, you'll have access to the fuel and vent lines. HTH.

[Opel GT007]

ahh, I C
makes a little more sense now.
From my experience on most cars, the sock was stuck directly
to the end of the sending unit. Hence the reason for removing
the sender. I searched on removing the sock, but it makes more
sense now that I see Its on the end of the fuel outlet line I think
which is Not part of the sending unit.
So crawl thru the back compartment, undo the fuel line and pull
the sock out with the retracting mechanism. I take it the "sock"
was suppose to be some sort of factory installed "filter" or "screen"
the dissolved when cars sit for long periods of time and the gas
turns to varnish ?
thanks guys

[Opel GT007]

Originally Posted by jmbinjax The sender and fuel supply are in two different locations. Assuming you're talking about a GT, the fuel supply is under the rear of the vehicle and the sender in located on the top of the tank and you have to remove the spare tire carrier to access it. The sock referred to previously is located where the fuel supply is. Depending on how corroded the connection is depends on the degree of difficulty. Once removed you may decide to replace it with a new supply line. Opel GT Source has a kit that includes what you need.

makes alot more sense now
Im use to working on cars where the fuel outlet, sock and sender
are all one unit (camaros, mustangs etc..)
Going to pull the line off both ends today and blow some compressed
air thru it first and go from there..
thanks.

[Lindsay]

Going back to permalink #1. GT mechanical fuel pump is less tall (shorter) than Manta/ 1900 fuel pump. Notice different height of fuel pumps.

[namba209]

Before you pull the fuel lines, get a container under there for the fuel to drain in. Once you pull the line there's no way to stop the fuel from emptying out of the tank. If it's still there, there's a rubber boot over the fuel line, once it's removed, soak the fittings with a penetrant like PB Blaster for a day or two, it will make life easier when you try to undo the fittings.

[Mike Preble]

I don't work this monday or tuesday but leave out to North Carolina on Wednesday for car show. If you would like some help, call me. 903-4576. I have worked on one or two Opels in my days.

Mike

[kwilford]

Originally Posted by Opel GT007 HI guys sort of new to the Opel world

Moderators Note: First thread merged with this one. Please do not start a new thread without searching for a related thread first (which I suspect you did to find this one, so thanks!) and please don't create two threads on the same topic. Also, please try to keep one topic to a thread to keep them "on-topic". Finally, the "GT" Forum is related to questions specific to that model that aren't better answered in the Technical Forums (which cover related issues across model lines). A useful link to watch regarding Forum conduct can be found at
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HTH and welcome