I am trying to do what I thought was a simple fuel filter change.
However, I am having suprising difficulty determining the fuel
pressure relief procedure on a 97 GMC Sonoma with the 2.2L engine. I
have two manuals which have conflicting methods on this dangerous
The Haynes manual says to loosen the fuel line outlet fitting at the
fuel filter with rags catching the spray. This seems OK, but not
desirable or safe.
My Chilton manual has four different procedures for the 2.2L alone!
The 1997 has its own method, which says to raise the vehicle, unplug
the fuel pump electrical connection, start the engine and let it run
until it stalls, and try restarting to make sure fuel has been
depleted. This seems far better, except how do you access the fuel
pump electrical connector? There is no access to it since it is
on top of the fuel pump, which is on top of the fuel tank. With
everything so tightly packaged, I can't see it, let alone unplug it.
It seems unreasonable that to change the filter I would have to drop
the tank. What should I do?
I don't think I can use another procedure, since the Chilton manual
so specific. Some people say to pull the fuel pump fuse, pull the
fuel pump relay, or even bleed the fuel rail service port valve. If
pulled the fuse, I would think it would stop the engine before the
residual fuel was depleted, since it also controls the PCM. Pulling
the relay possibly might be detected by the PCM. Finally, I don't
believe I have a test port on my fuel rail, since the fuel pressure
check requires removing the fuel filter and installing a T-fiting
the fuel pressure gauge. Models other than mine do have a Schrader
Any ideas? Thanks for your input.