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Bad FPR? 200

posted by  jkordzi on  Mon Apr 7 05:13 CST 2003
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last visit: Wed Sep 12 02:43 CST 2001
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With the vacuum line to the FPR disconnected, the fuel pressure in my 93 245 measures 55 psi. at idle. With the vacuum line to the FPR connected, it drops to 45 psi. If I connect a hand vacuum pump to the FPR, the most it will drop to is 41 psi. After 40 minutes with the engine off, the residual pressure is 24 psi. The Bentley manual says the pressure at idle (with the vacuum line disconnected) should be 43.5 psi. I'm thinking either there is a restriction in the fuel return line to the tank, or the FPR is bad. I understand that the main pump has a check valve that regulates the flow back to the tank. Could this be bad? How do you check this? Thanks.








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    Bad FPR? 200

    posted by  john r. on  Mon Apr 7 08:27 CST 2003
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    last visit: Tue Mar 9 09:41 CST 2010
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    If you disconnect the return line from the regulator and attach another hose to it with the other end of the hose into a gas can, you should be able to run the engine and check to see if the fuel pressure changes. If the fuel pressure is lower now there is a restriction in the return line. If the fuel pressure doesn't drop replace the regulator. To see if the check valve is leaking gently squeeze the return line closed with a pair of locking pliers and pressurize the system. Check to see if the fuel pressure drops now, if it doesn't with the return line closed off then the check valve is leaking. Hope this info helps.
    John







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