Expert Fuel Pump Opinions Needed!

Gdetrailer wrote:

John Burke wrote:
You may want to try an aftermarket electric fuel pump to help figure out if you have a in tank fuel pump issue before spending time and a fair amount of money for a new pump.
There must be a rubber line somewhere, by the filter or between the frame and the motor. The fuel filter below the seat would be a good place. Just put an electric fuel pump in line where the filter is and run it off a jumper wire, extra battery or a battery charger. If it is all steel line you can put a piece of rubber line over the steel line and clamp it on.
You can get a pump from Amazon from 12.00 to over a 100.00. just get a cheaper one.
This way should be a lot easier diagnostic tool than dropping the tank and putting in a expensive replacement pump.

While you could do that, it doesn't prove that the pump, ECM or wiring to the tank is good or bad.

Not to mention most of those aftermarket fuel pumps often will not have as much pressure as the OEM and may or may not even start the engine. This isn't a carbed engine and OEM fuel injection systems tend to require pretty high pressure just to get then to start.

To "prove" whether it is ECM, wiring or fuel pump with an external pump, OP would still need to drop the tank to access the OEM wiring connector on the tank.

OP has a 20 yr old vehicle which has been sitting for some time. Fuel pumps do go bad and it has enough age and sit time that makes it highly possible the pump bearings has rusted and/or frozen. Or the internal tube could have a pinhole(s) in it or broken off due to rust from sitting around.

Once OP has tank dropped they could bypass the ECM and wiring by disconnecting the wiring harness from the pump and connect the pump directly to the battery (observing polarity and not putting battery power on the tank sensor wires so they will need to figure out which wire is which) and see if they get pressure at the rail.

And he's assuming that one could pull fuel through the dead pump as well. BTW, pulling fuel doesn't work near as well as pushing fuel, hence the reason electric pumps are generally located at the source (in the tank).
A well intentioned suggestion, but OP hasn't even responded. Either the pump runs (makes noise) or doesn't. Presume doesn't but he hasn't confirmed. And if it does and aint pumping fuel, then its still shot, but at least can be diagnosed as the pump and not something upstream in the power supply.