I need help, my car is stranded at work. I'm pretty sure my fuel pressure regulator has died. When you turn the key to 'on' you can hear the fuel pump prime, but the FPR won't hold the pressure. It goes up to 40lbs but drops to 0 with in 5 seconds. If you crank the car the pressure will stay steady but when you stop cranking it, it drops to 0 again.



Its an Aeromotive A1000 and it's got to be less then a year old. Has anyone heard of these things dying all of the sudden? Could it be something else like the fuel pump letting the fuel flow back thought it?

is there fuel in the vacuum line?

not sure, it was about 10pm and pitch black outside so I wouldn't been able to tell anyway. When I go to meet the tow truck guy tomorrow I'll check.



Could it still fail and not have fuel in the vacuum line?

Could be, leaking injector or bad check valve in the fuel pump also. If the pressure stays steady while cranking I'd say you have another problem becides a bad FPR.

yes, but if it does have fuel in the line, its definately bad

I'm starting to think its a sticking fuel injector, we switched out FPR's and it still does the same thing. Now I've just got to go rip my manifolds off and find out which one it is.

i pulled the manifold off and the checked the impeadance on the injectors and they checked out fine. I then proceeded to hook up a 9volt to each one to make sure that they fired, all did. The results of these tests seem to say that the injectors are working properly.



Is there a good way to test the check valve in the fuel pump to make sure that is working properly?

https://www.nopistons.com/forums/pub...#>/biggrin.png I think you've already conducted that test, no? https://www.nopistons.com/forums/pub...#>/biggrin.png

indeed, it would appear so https://www.nopistons.com/forums/pub...IR#>/smile.png



however, i didn't come up with another possablity, the connection between the haltech and the injector clips could be lose and casuing the injector to open. https://www.nopistons.com/forums/pub...1047683664.gif

If it's coming out the injectors your car would be swimming in gas by now.