Sounds good. If you have compressed air, you might trying to blow out the two lines first.
Jim

 

sounds great.. you may be able to just disconnect the fuel line and see if the fuel flows out (if i rember correctly you already blew the lines out and found air comming outta the tank) if that doeant work you can either suck on the fuel line to get gas flowing or use the compressed air and a rag and GENTLY put alittle pressure in the filler neck. or just pour a mall amount of fuel into the float bowls thorugh the float vent dont make a mess) or use starting fluid.. soo theres lots of options. intrested to see what you find out.. if it runs fine with the gas cap off then i would make sure the line to the canister is clear and then cheack the canister..

good luck, JOSH

 

Well, now it blows! Hot 90+ F day, left the garage door open all afternoon with the sun shining directly on the back of the car and late in the day, shinging right on the fuel tank.

Came in to 3' pool of gas on the floor that had leaked out of what I assume was one of the metal gasline-rubber hose connections. There was gas in a couple of indentations toward the front of the engine so I assume it wasn't from the Holley. The puddle was centered on the front of the left side of the engine. When I opened the gas cap there was quite a bit of pressure to vent. Earlier in the week, we had fired it up and it ran fine on the gas it drew from the gasline.

I think this is an indication that the cannister system is not doing its job venting the tank. We have not yet tested either the cannister or its connection to the fuel tank but from the descriptions on this thread, it seems the the tank should never have either positive or negative pressure.

Next step, check the cannister system and its connection to the gas tank.

Thanks to everyone for the great ideas!

Brian and Zak

 

The theory is based on a 'closed' gas tank and fuel system. Your gas cap is not vented, this much is pretty much common knowledge, and to allow air in to replace the gas, a second line to a special carbon filter canister is used. The canister is itself vented to the air cleaner so no gas vapors can ecsape into the atmosphere to cause global warming and kill bunny rabbits. If there is a blockage in the vent lines, you get the problem you have. I had a similar situation on a 71 VW Beetle, lots of extra plumbing required to pass smog most of which never worked anyway.
Jim