I’ve got a fuel pump which appears to be “running” but not pumping fuel downstream. Checked voltage at pump OK. Removed pump from car, hooked it up to battery, and it pushed fuel thru a fuel line. Blown out fuel lines with compressed air. All clear. I don’t understand this situation at all.
Am I missing something? BTW it’s fuel injected. D-jet.

Does that mean you have no pressure or fuel at the fuel rail.30-31psi. Does the pump sound as if it is running when you switch on the ignition? Fuel pump relay? Fuel filter not mentioned. Does this system have a non return valve like the 240?

No pressure at the rail. Pump is working when I removed it and hard wired it to the battery, connected to a hose /can of fuel for supply and return.
Relay clicks, can be heard and felt.
12 v. at the pump electric connector. All lines blown clean with air compressor.
Pump is an after market part which has two ports, an inlet (from tank) and outlet (to fuel rail).
I plumbed it per the directions when it was installed years ago and it has worked perfectly.
Fuel from pressure reg. returns directly into fuel tank.
Fuel flows freely from tank through filter (gravity) into pump at suction side but nothing comes out of output side, until it’s removed and set up as I described before.

Most two port pumps have an internal by-pass mechanism of some kind to deal with a plugged fuel filter or other blockages. It almost seems that the internal by pass may have opened up permanently on your pump which is preventing it from developing pressure. If the pump is out of the car, use some fittings to attach the fuel pressure gauge directly to the outlet of the pump so that you are dead heading into the gauge. Power up the pump just briefly since if it works correctly there will be flow. You just need to power up for a second or two to see if it develops pressure. If the pump starts up; but, it does not develop any pressure then the internal by pass is stuck open or there is some other kind of internal mechanical failure.

Good idea thanks.