posted a little while ago saying I thought I was having fuel problems because it took so long to start up my car. Finally got ahold of a fuel pressure tester and here's what I found out. Car off and key turned to acc it reads 42psi and then instantly starts falling to 0 in about 3-4 seconds. With car running it reads 35 psi and I connected a vacuum line to the regulator and pumped in 12 in/hg of pressure while car was on to see if the pressure went up or down and it went up a bit. Hope this helps I really want to figure out the lean problem I'm having.

 

Sounds like exactly what my car was doing last week... Normal pressure as the pump primed, when it stopped it would quickly drop to 0... I ended up replacing my fuel pump and it solved my problem.

 

Maybe that's what I need to do but what do you think is causing that then?

 

Usually the regulator sees vacuum or at the most, atmospheric pressure. Never seen anyone put positive pressure on it. But, 3 things can cause the pressure to drop like yours does causing long cranking. Injectors sticking open, hole in the regulator diaphragm and the check ball in the pump allowing fuel to flow away from the rails and drain into the tank. This is what "94" experienced.

Injectors and regulator give long cranking symptoms but, in a different way. If they are leaking, they flood the engine and it starts easier by holding WOT while cranking it over. A bad check ball in the fuel pump will respond to turning the key on engine off KOEO for 2 seconds and then off. Do this cycling on and off about 5 times and then try to start it. If it starts easier on the last try, you know the fuel is backing away from the rails and is usually from a bad pump check ball. A leak can do it too but that will usually be self evident.