Fuel pressure regulator vacuum problem?
18 January 2004, 10:05 PM
#1
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Yesterday I fitted an FSE fuel pump and adjustable pressure regulator to my car, MY93 WRX. On fitting the equipment I started the car and adjusted the pressure so that it was shown as 3 bar on the gauge.
Now then, having looked at Abbylad's P1, if he disconnects the vacuum pipe from the manifold, the fuel pressure shown goes up to 3.2 bar. On my car when disconnected it does not move at all. It does not affect the running of the engine either. Is this correct? There is a minute amount of vacuum at my manifold, whereas Abbylad's car has an audible suction. Is this just a difference between Pahase 1 and Phase 2 engines?
Any advice would be greatly appreciated.
Now then, having looked at Abbylad's P1, if he disconnects the vacuum pipe from the manifold, the fuel pressure shown goes up to 3.2 bar. On my car when disconnected it does not move at all. It does not affect the running of the engine either. Is this correct? There is a minute amount of vacuum at my manifold, whereas Abbylad's car has an audible suction. Is this just a difference between Pahase 1 and Phase 2 engines?
Any advice would be greatly appreciated.
19 January 2004, 01:38 AM
#2
do all your checks with the engine at full operating temperature!
If you are running with a standard map etc then you should set the presure to 3BAR with the vacumn hose disconected, when you reconect it the reading should be 2.6BAR.
If you tst this with the engine cold you wont get the correct readings. If you arnt getting a presure change even with the engine hot then you have an air leak somewhere, idle should be 750rpm.
If you are running with a standard map etc then you should set the presure to 3BAR with the vacumn hose disconected, when you reconect it the reading should be 2.6BAR.
If you tst this with the engine cold you wont get the correct readings. If you arnt getting a presure change even with the engine hot then you have an air leak somewhere, idle should be 750rpm.
19 January 2004, 10:07 AM
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Do you have a boost gauge?
what does that read at idle?
Sounds like you haven't connected the vac line although sounds a silly thing to suggest..
Have you run a new one from manifold to the pressure reg or reused the old one?
There should be three connections on the inlet manifold.. one to reg, one to dump valve and one to MAP sensor (via the Pressure exchange solenoid)..
JGM
what does that read at idle?
Sounds like you haven't connected the vac line although sounds a silly thing to suggest..
Have you run a new one from manifold to the pressure reg or reused the old one?
There should be three connections on the inlet manifold.. one to reg, one to dump valve and one to MAP sensor (via the Pressure exchange solenoid)..
JGM
19 January 2004, 01:38 PM
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I've run a new vac pipe fronm the manifold to the regulator as the old one was brittle and snapped
when I removed it from the oem regulator. At idle when hot it shows around -0.5 bar(roughly from memory) on the boost gauge.
when I removed it from the oem regulator. At idle when hot it shows around -0.5 bar(roughly from memory) on the boost gauge.
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