Thread: Fuel pressure

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Originally posted by 76jimmy
the pressure guage is located in the dual holly feed line @ the carb- 6an. i currently do not have a pressure regulator installed. after the motor warms up the fuel pressure drops and stays @ 2 1/2-3 psi @ idel. it will not rise again until the motor cools down for a few hours. also this is the second fuel pump i have tried and its doing the exact samething. i checked the fuel pump rod, restictions in the fuel line, i cant find anything wrong.

Something is wrong, sounds like the hose might be sucking closed or the cap not vented or the sock in the tank is stopping up after it runs awhile. Try blowing the sock off of the line in the tank and check for soft spots in the rubber hoses. if you get it fixed you need to get that 9 psi down to 6 psi or it might be to much pressure. if its not to much trouble after the pressure drop take a line loose at the pump and run a line into a can of gas and then crank it up and see what happens. if it still does the same thing it will be the pump or lines going to the carb. and if it fixes it it will be the something behind the pump. be careful with that can of gas.

ps.. be sure the gauge is ok