My vehicle is a 1994 XJ6 with 130,000 miles originally sold
I have been chasing down some issues relating to a failed
smog test, and I was wondering about the fuel pump. I may
ask about the failed smog test in the future, but for this
post I’m interested in the fuel pump. As far as I know I
have no pump related operating issues. I can run the engine
at high RPM and wide open and it goes great. It seems the
consensus on here that the pumps can fail after 100,000
miles. I was going to check the pressure and volume.
Unfortunately my pressure check setup has the wrong fittings
so I couldn’t check the pressure. The only thing that I
could do was to check the volume. I disconnected the fuel
input to the injection rail and directed it to a gas can. I
then jumpered the fuel pump relay so the fuel pump would
run. Only about 1 liter of fuel came out and then it
started pumping air and gurgling. I had fuel in the tank,
but it was only at about 1/4 tank. I reconnected the fuel
line and after about 1 minute of fuel pump running time, I
was able to start the engine. Everything seemed fine and
the car drove normally. I tried the volume test again and
the very same thing happened.
Does this indicate a problem with the pump? I have never
seen this in any other vehicle. I have always been able to
run a fuel pump with no back pressure and it would pump out
the entire tank if given enough time. It seems like this
pump needs the back pressure to pump fuel.
I can get the Walbro pump locally for around $85 US. My
‘‘non-return valve’’ doesn’t work either. Is the non-return
valve replaceable without buying the entire fuel pump
assembly for the insane price? If the internal non-return
valve is not available, can I put a check valve in the fuel
supply line to the engine. What part number would I use and
where can I get one.
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