Re: Fuel shortage issue :-(

Posted by humanpotatohybrid On 2024/3/2 9:49:46

Good advice from TxGoat. You said 8 miles, so that's probably 15 min of the engine running? I would have to guess fuel tank ventilation. I believe 53's used a vented cap, but I don't remember specifically. I don't think it would hurt anything to buy a vented cap for testing.

Example:
Let's say your tank is 3/4 full (=5 gal air) and you use half a gallon of gas in driving. Disregarding fuel tank shrinkage, you have expanded the air by 10%. So instead of about 14 PSI absolute, you have 12½, or in other words -1½ PSI gauge pressure from the tank to the outside that the fuel pump would have to overcome. Considering that fuel pumps often only pump about 2-4 PSI, I could definitely see this being the issue.