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Thanks for taking the time to reply .. I had the stock TQ with the phenolic space which I kept and put on top of an edelbrock performer intake. I also took your advice and insulated the fuel line. But the real problem was a worn fuel pump rod .. see photo .. it is a good 1/4 inch shorter that...
I think the vapor lock was brought on by the fuel pump not working right and then allowed a smaller amount of gas to flow and vaporize. I thank all of you for thinking this through for me.
Well .. found at least a serious root problem. The new fuel pump didn't perform any better than the old one. Took out the rod that rides the cam and drives the fuel pump and found it to be about 1 inch shorter than one from another 400 CID block.
With my expensive Comp cam and valve train...
Update: Okay .. so my actual problem is after running about 20 mins, the engine stops with a typical out of fuel experience. I dump raw gas down the carb, she fires up and runs till that gas is exhausted. I suspected vapor lock as it happens when the engine is hot.
So .. put a fuel...
Thanks ... :hello2: I do notice that when the engine stops .. I can go back to the licence plate (LOL) lift it up, undo the gas cap and hear a pretty loud hiss ... I don't know of course if air is coming out or going in.
I like the idea of a pusher pump as I could use it when needed. I am...
Thanks Ron .. your description of vacuum and sucking makes sense .. first thing I am going to try is a fuel pressure gauge on the other side of the fuel pump to see if that thing is not happy. Then make sure I am getting my fuel to that Holley under pressure ...
Will let you know.
More .. I noticed when they rebuilt my engine .. they dropped the line that went to the (useless) charcoal canister ... I need to make sure my gas tank is vented as another possibility is after about 20 mins a vacuum could build up in the tank and refuse to let fuel flow to the pump and on to...