Question on fuel pressure>> - ZR-1 Net Registry Forums

-=Jeff=- · 05-19-2008

okay..

I checked the Fuel pressure on my car last night. I shut it off areound 8pm from the test drive. I hooked up the fuel pressure gauge around 10pm to check.

Ignition key one, engine not running, pump primes to around 48psi, then steadily falls down and sits at 20psi (falls down over the course of a minute)

this am I went out there pinched the return line hose, key on, engine not running, pump primes to 48PSI and settles at 44PSI.. I repeated the SAME steps as but without the return line pinched with the SAME results.

so why the fall of when the engine is warm, but not when it is cool?

05-19-2008	#1
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,169	Question on fuel pressure>> okay.. I checked the Fuel pressure on my car last night. I shut it off areound 8pm from the test drive. I hooked up the fuel pressure gauge around 10pm to check. Ignition key one, engine not running, pump primes to around 48psi, then steadily falls down and sits at 20psi (falls down over the course of a minute) this am I went out there pinched the return line hose, key on, engine not running, pump primes to 48PSI and settles at 44PSI.. I repeated the SAME steps as but without the return line pinched with the SAME results. so why the fall of when the engine is warm, but not when it is cool? __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978