Try this trouble shooting riddle

IGOTBIT · #1 (**permalink**) 10-09-2006, 08:56 PM

I seem to have an issue with fuel supply. One of the first times I had it out, it stalled on my and would not start for about 10 minutes or so. It was a warm day, and I was idling in construction traffic (the best place to become disabled)

It has done this a few times since. I changed the in-line fuel filter just upstream of the mechanical fuel pump. I have noticed some consistencies when this is happening. It seems to happen when idling for long periods. It seems to happen more when the gas tank is full. When I am having trouble, the fuel filter is over 50% air.

Thinking about vapor lock (hadn't heard that phrase in a while)

I rerouted the fuel line and clamped it up off the intake manifold and replaced the hoses while I was there. At one point, the day after I returned home with it running bad, I pulled the line off the fuel pump, and it did not flow. I opened the gas cap, and put the air hose in the line and gave it a squirt. Even with my friend holding a towel over the opening, gas flowed out over the fender

anyway - the odd thing was that gas started flowing, and I put the hos back on quickly, but surprisingly, the gas level in the filler neck did not receed until we we moving. It started again, and I tried just opening the gas cap thinking it might be a vacuum situation, but no avial.

Any ideas?

Jerry Clayton · #2 (**permalink**) 10-10-2006, 07:46 AM

You need to fix the tank vent

When the tank is full it will pull a vacume much quicker than when lower-

Try just driving around with the cap loose to check it out

Jerry

Tommy · #3 (**permalink**) 10-10-2006, 08:34 AM

IGOTBIT -
Have you experienced fuel starvation problems other than after sitting at idle for several minutes?

IGOTBIT · #4 (**permalink**) 10-10-2006, 06:24 PM

Sometimes even driving around it does it. Another possible clue is that it is difficult to fill the tank. It keeps backing up. I have to go real slow.

I was thinking about the tank venting, so I figured just opening the cap and closing it again would fix it, but no success. I did not ride around like that. Where is the gas tank vent? Is there a vapor canister?

392cobra · #5 (**permalink**) 10-10-2006, 06:31 PM

Like Jerry said.You have a venting problem.

IGOTBIT · #6 (**permalink**) 10-10-2006, 06:43 PM

So what's the fix?

Tommy · #7 (**permalink**) 10-10-2006, 06:58 PM

Perhaps this thread will provide some clues: click here.