Re: Proper psi at carburator

Posted by Mike On 2011/5/4 10:30:16

I never added a gauge to the suction side because i had fuel there, and it didn't help my troubleshooting process. I wasn't considering its use for vapor lock as much as a little bit of info as to what was going on right before the carb for troubleshooting later if i did something wrong.

I know a regulator can't increase fuel pressure, but rather restrict it. I was having a sort of flooding issue at the time and i thought that the fuel pump was overpowering the needle and seat in spurts as it pumped. I wanted a regulator to back it off to about 3 psi to see what would happen.

I've had some others warn me about that cheap regulator after i had bought it also. Maybe it's just a bad design.

However, even if you had no fuel coming in on the suction side due to vapor lock or out of gas or what have you, the car is usually sitting with 3-4 psi of fuel pressure when off. If you went to start the car and pumped the pedal once or twice, the pressure in the line would top off the bowl. Even if you were out of gas or the suction line disconnected, the car should still start. Just for a moment or two until you're out of gas in the bowl. With a clear suction line, i didn't see any need to put a gauge there.