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Failed Fuel Pump 900 1995

Hi All. 1995 8-valve 940 Wagon 225k. Single in-tank fuel pump - as unique to the 1995 model year.

Trying to decide if my pump has failed.

A little history. My fuel pump failed abruptly back in May. I bought a brand new OEM fuel pump from Tasca volvo. Installed it, and had trouble-free operation until yesterday - January 14, when the car suddenly failed on my wife in a parking garage.

One day and a $150.00 tow truck ride later, I've confirmed that I am getting NO FUEL at the fuel rail. I've checked fuses and the relays. Fuses are good, relays are clicking. There is fuel in the tank.

With the fuel hose disconnected and put into a bottle, I cranked and confirmed nothing at all is getting out. The hose is dry.

I headed to the rear, pulled the connector for the pump and applied 12 volt power to the pump - here, I hear a small knock (pump against heavy plastic fuel tank) and I am pretty sure there is a small buzz. I'm going to pull the panels and listen more closely.

With 12-volt applied, there is *still* no fuel getting up to the front of the car.

My competing hypotheses are these:

1) Fuel pump has jammed or otherwise failed.
More power will just burn it up. I must pull the whole assembly (again) to confirm and then drop another $200.00 on yet another OEM Volvo Pump.

2) No power is getting to the pump from the car.
Seems unlikely since 12-volt power causes the pump to jump and make noise but nothing is getting up to the fuel rail.

3) My fuel filter is amazingly clogged.
It is older, haven't changed it for a few years at least. Seems like a good candidate, but the failure doesn't seem to jibe with the symptoms. It should let *some* fuel past or should have failed more gradually - slowly choking the car over a few months, not a sudden death in the middle of the day.

That's all I can come up with.

I'm going to pull the old fuel filter and see if I can pump some fuel from the tank to a container.

Aside from confirming voltage is going to the pump from the electrical system I can only think of pulling the pump assembly again (which is no fun at all).






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New Failed Fuel Pump [900][1995]
posted by  RepairmanJackal subscriber  on Fri Jan 15 07:27 CST 2010 >


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