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Injector Pump Overflow Valve Diagnosis
See TSB 14-07-96 for additioanl fuel pressure and overflow valve tests.
|The most common problem related to the injection pump is the Overflow valve, located at the return line connection. Look for this connection at the front of the injection pump on the engine side of the pump.|
Subject: Re: Low fuel pressure
From: "Fest3er" <email@example.com>
> I've had a couple responses on the question of low fuel pressure, but
> still not the answer I need. Can someone tell me the process of
> analyzing whether the problem is the valve or the lift pump? I am
> taking the pressure reading on the output side of the fuel filter.
> Where exactly is the pressure valve?
According to my '98 manual, the overflow valve is on the left side of the fuel injection pump, near the front. It says the valve opens at about 22 PSI; the transfer (list) pump supplies fuel to the injection pump at about 25 PSI.
Skipping to the Diagnosis and Testing section (paraphrasing)....
Replacement overflow valves are available from Piers
Diesel Research Inc.
Phone 604 888 4159
|Use a 3/4" wrench to unscrew the valve. Make sure that
you do not lose the
sealing washers on each side of the fuel return line fitting.
Last edit to this page: April 11, 2003