I finally picked up a fuel pressure gauge kit yesterday to check pressures. Car had been running terrible again and lean O2 sensor codes 44 and 64 had popped up simultaneously. At first i thought it might be the Idle Air Control Valve as it said in FSM that it could set those codes.

Now that I checked pressure here is what I found. Last night my first readings with key on only 15psi. Started vehicle and had innitially 35psi, this is below the 41-43 range it should be. as the engine ran for a few minutes it dropped and engine sputtered and ran rough with pressuresdropping to 12-15psi and engine died out. Could not get it above 20 at various rpm's. My first thought was that the screen in the regulator was plugged. So since I had a new one I changed it, but screen looked ok and it seem to hold vaccuum and left new one on. I also ruled out relay as I had intial pressure when I turned key on. Had a problem with a couple injectors leaking after putting rails back on, so took the left side back off and used extra vaseline on o-rings and reassembled and left set 'til this morning to check pressures.

Turned key on this morning and had 15 psi twice before starting. Started and went to 20 psi. remained steady for a couple of minutes than began droping and engine sputtered and died. The fuel filter has about 3000 miles on it, don't feel that is a problem. So that leaves the fuel pump and strainer. It was supposedly a fairly new pump less than 5000 miles high output Granatelli pump. Obviously I am not getting enough pressure to the regulator and volume, so is that where the problem might be now?? Any othe ideas that I am overlooking?? Could the pump have low voltage and cause it to run less pressure? Will a bad relay cause lower current to go to the pump?

Thanks,

Scott