So my work van died on me, wasn't getting fuel. Replaced fuel filter,
which wasn't bad, but due for one. Thinking fuel pump went out, and for
years the fuel sending was flaky, I just ordered a new fuel pump
assembly from Rock Auto. Ended up going with the cheap Startex after
hearing from a couple people that AC Delco's were crap.
Pulled fuel tank, cleaned it out thoroughly, had to install the supplied
electrical adapter for fuel pump and sending unit. Before installing the
fuel tank, I hooked it up, turned the key on, couldn't hear the fuel
pump, so I disconnected the harness and checked V at the harness, no power.
I then talked to a couple buds in IRC who suggested disconnecting
battery, check ECM fuse, check if relay is getting power, and install
the tank and put gas in it. Did all that, still no power to fuel pump.
Doing some searching for a wiring diagram (which I never found) I saw a
few comments on forums relating to the circuit. One was computer gives
power to the fuel pump relay for 2 seconds when starting, after that I'm
assuming it routes power through an oil pressure switch.
So my problems are now: Fuel gauge reads dead empty (have 6 gallons in
it) Quite possibly I have the sending unit wired backwards, although I
was very careful in trying to get the supplied harness (4 wires, 2 for
fuel pump, 2 for sending) wired correctly. I did solder the connections.
And no power to the fuel pump.