Thread: Fuel pressure ???
07-25-2011, 11:11 AM #1
Fuel pressure ???
I am testing the fuel pressure, when installing the lanyard and the fuel pump runs for approximately 2 seconds and shows approximately 60 PSI. Once you remove the lanyard how long should it hold pressure ?
In the service manual it mentions rapid and slow pressure loss, just looking for a general idea on how much time that would be.
ETA- this is with the stock fuel pump and pressure regulator on a '07 RXP.
07-25-2011, 11:20 AM #2
my RXTX w/riva RRFPR holds pressure ( not full 58psi) for a while, it bleeds down slowly. My GPRXP with a Aeromotive RRFPR and a Beerdart rail bleeds down almost to 0 seconds after the fuel pump stops priming.
07-25-2011, 08:42 PM #3
Never measured my stocker, but with the Riva RRFPR set at 60 psi, as soon as I remove the key it starts to go down somewhat quickly ... I think that is pretty normal.
07-25-2011, 08:47 PM #4
07-25-2011, 09:10 PM #5
If you have a RRFPR, pressure drops quickly when you kill the engine due to the return line.
My stock fuel pump/ regulator seems to work ok at idle. Going to go to a Walbro to see if that helps. Some time this week I hope to be able to do a leak down test.
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