Holley Fuel Pump
I'm running a holley 12-600 pump to feed the go street 400 hp unit. I've had issues with cold starts from day one. I know a lot of people say to lower the prime shot but on mine if I cycle the key 2 or 3 times it fires right off and stays running. Last week I installed a pressure gauge and noticed the my psi is only 40 pounds. Could that be part of my problem?
Just to clarify, your pressure reading was with running or not?
Check your fuel line fittings. If they are not completely tight - you could have the fuel bleeding back into the tank. I installed a check valve at-the-tank. Now my car starts at the 1st crank.
Austin, it shows 40 p.s.i when running. 69 r code, I double checked all the fittings when I installed the gauge and found no leaks. As far as leak down, I let it sit for 1 week to see if it would loose pressure. After one week the gauge still showed around 30 p.s.i.
Fuel pressure is about right for a 400 unit. Your cranking fuel is a long process of trial and error. Most of us turn off the prime shot and adjust the cranking fuel according to engine temperature.