I have been troubleshooting a fuel pressure bleed down issue for a while now. The rail doesn't hold pressure after the car is shut down. It slowly bleeds down.
If I clamp the supply line it still bleeds down so I know it's not the check valve. If I clamp the return line it slows it way down and retains pressure longer.
Bentley says "repeat the above pressure
test while gradually clamping off the return hose at the fuel
pressure regulator as shown in Fig. 6-26. The pressure should
rise to at least 3.2 bar (46.4 psi) or possible higher. If it does,
then the pressure regulator is faulty and should be replaced"
When I clamp down on the return line while jumpering the relay it'll shoot up to like 80psi. Tried 3 different FPRs that I have, all 3 same result so it's hard for me to believe they are all faulty. One was on from PO, one is a used one from a local member, one was a new one from Autohaus AZ that I have been running for months now.
Could it still be the FPR? I don't think it's injectors leaking but not sure how to know for sure. They were rebuilt and flow tested.
If I clamp the supply line it still bleeds down so I know it's not the check valve. If I clamp the return line it slows it way down and retains pressure longer.
Bentley says "repeat the above pressure
test while gradually clamping off the return hose at the fuel
pressure regulator as shown in Fig. 6-26. The pressure should
rise to at least 3.2 bar (46.4 psi) or possible higher. If it does,
then the pressure regulator is faulty and should be replaced"
When I clamp down on the return line while jumpering the relay it'll shoot up to like 80psi. Tried 3 different FPRs that I have, all 3 same result so it's hard for me to believe they are all faulty. One was on from PO, one is a used one from a local member, one was a new one from Autohaus AZ that I have been running for months now.
Could it still be the FPR? I don't think it's injectors leaking but not sure how to know for sure. They were rebuilt and flow tested.
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