Fuel leakage problem b76 308

Hi Anthony,

sorry to hear your issue isn't resolved yet.

Wish I had some concrete answers for you but I don't. I do have a 77-B with the engine out and I'll take some pics and have a close look at every thing to see what I can determine.

Regards, JRV

Thanks so much.............

Anthony

Anthony,

ok, had a few minutes to inspect this 77 left my camera at home).

Yes this 'check valve' is attached to a short lenght of hose to the filler neck with nothing on the exit side of the valve. I have never had to replace one of these so I don't have any personal knowledge of them going bad or what they do. However from the look of the attachment and configuration it looks to be a pressure vent. It appears this valve would vent pressure (fumes) in the event of an excessive pressure build-up in the tanks. I seriously doubt it is for venting liquid, however I suppose "IF" the fluid did get that high it would also vent the liquid. It would then vent the liquid onto the top/side of the gas tank and on the inner fender, letting the raw fuel run down onto the frame. However, it's unlikely it could run all the way back to the rear of the car, while possible, seems very unlikely, but, if enough fluid got onto a tire, it perhaps could have thrown the fluid rearward and out the back as you described.

HTH's

JRV.

Thanks JRV, I was thinking that this would allow the tank to suck air to remain at atmospheric pressure also. You're right, I do not think fuel would run around to the rear of the car.

If it was my metering assembly or a seam on top of the tank, I still do not think fuel would have came out the rear. So, ow I am back to square one.

I am thinking about filling the tank, letting the car cool. Then restarting and making a sharp right hand turn to replicate the problem - not the best or safest way, but I would like to find out where any excess fuel is going.....

Thank you for your time,

Anthony

Anthony,

one thing you could try first is to pull out the check valve and test it to see if perhaps it's stuck open or closed.

To test put a small amount of air pressure on the tank end of the valve and see if it is constantly open or requires some pressure to open and then draw a vacum on the atmosphere end to see if it'salways open or requires some vacum to open..

Good tip, thanks.....now if I can only get at it!

Well, my problem turned out to be the obvious - which was not so obvious! ?

The leakage was coming from the fuel filler neck -there was a razor-like slit JUST below and parallel with one of the clamps (as if the clamp cut into it). This neck was supposed to ne relatively new, but it looks as though it was the wrong type anyway.

Thanks for all your help,

Anthony