Fuel flow from gas tank

[wlkelley3]

Try jacking drivers side of car up 3 or 4 gallons is not the much, I would suggest as others to try to siphon the remaining gas out then jack up the whole left (drivers side) of car up remaining gas should run to opposite side of the tank and allow you to remove the connector without worrying about be bathed in the old gas.

Man I didn't even think about that. Simple solutions, sometimes I just overthink things. Getting jackstands out now. Should at least minimize the amount of gas I'll have to drain.

[wlkelley3]

5. Give your tank a few hours or a day to dry out and vent. With a screwdriver remove the fuel pump from the top of the tank.

Umm...you have a fuel pump in your fuel tank? Electric fuel pump? The only fuel pump on my 70 is the mechanical fuel pump on the engine. And yes I've checked the tank.

[grslightng02]

Sorry my error, that's not the fuel pump that's the float that tells you how much fuel is in the tank.

[newman27]

I bought my '70 GT after it had been sitting for at least a year or two unused and figured I wanted to make sure the fuel system was clean, and do things right the first time...I may have missed a few things...I'm not an expert, but this is what I learned along the way and I hope this helps you and anyone else out there with this project to tackle.

Happy Opeling, NEIL, Sacramento, CA

Wow - excellent post Neil! Detailed instructions like this can't be found in the FSM or any of the various third-party repair guides I have seen. It takes a lot of time to type something up like this and I'm sure others will benefit from the information.

Matt

[wlkelley3]

Sorry my error, that's not the fuel pump that's the float that tells you how much fuel is in the tank.

whew, I thought that maybe that was something else different on my early edition 70 from the later ones. Years ago when my family got the car from friends, the car's mechanicl fuel pump was broken so we bypassed it and installed an electric inline pump at the tank temporarily just to get it running and removed it when I put in a new mechanical pump. Still have the old electric pump someplace.

[mike911]

Thread related - Does anyone know the specific thread type of the fuel outlet fitting?

That's something I'd like to know myself.....It looks to be a taper thread going into the tank, but the pitch matches up to 1.5mm. I can't find anything like it in the latest edition of the Machinery Handbook.

[tomking]

I believe it is 14mm x 1.5mm

[mike911]

I'm pretty sure it's something different than a 14mm. It is tapered and the large end is around .480 in, which is around 12mm or so. I'm wondering if it is a special thread that Opel came up with. Wouldn't be the first time I saw somebody do something like that.

[RallyBob]

I'm pretty sure it's something different than a 14mm. It is tapered and the large end is around .480 in, which is around 12mm or so. I'm wondering if it is a special thread that Opel came up with. Wouldn't be the first time I saw somebody do something like that.

It's simply a 14 mm metric pipe thread. Common in the rest of the world, just not the US.

[RallyBob]

Here you go, 14mm pipe thread is listed as 14 x 1.5 pitch (tapered).

http://www.metricmcc.com/catalog/Ch5/5-530.pdf

[tcav]

I also whent thru the prosess of cleaning a gas tank full of rust.Removed tank,cut out the old sock,took both radiator and gas tank to my local radiator shop and had both boild out in their tank and then went thru the prosess of lineing the tank with the Eastwood gas tank sealer and restoration kit.part #10165z Its on sale for $49.99 was a very easy prosess to do,had to run down to Ace hardware and get a gallon of muriatic acid and some acetone,but in the end for under $70.00 fuel now comes out clean and clear.
The search feature on this site contains so much knowledge about our cars,But so much info their it creats more questions.Nobody should be belittled or talked down to for asking questions...