Thanks to the people who replied earlier to my query. I had the Wagon towed to a friend's house (who is better equipped and more mechanically inclined) and finally had the chance to work on it.

We got under the car and removed the leads to the old fuel pump: No Juice

Put the multimeter to fuse #6 on the buss: No Juice (I believe #4 was also dead)

Checked the 25 Amp fuse under the hood: 12.3 volts there. And that is the farthest that the electricty was traced.

The fuel pump relay clicks on and off when we turn the key on and off. Even so, should we check the contacts on the relay socket?

Do we smell a bad ECU? Earlier I mentioned I got a 1-4-4 error code on the diagnostic unit, i.e "Load Signal Missing (from LH control Unit) Control unit assumes the engine is at full load" Would the LH unit assume this because there might be a short somewhere? Or that the unit is shot? (as far as shorts, I have not had a single fuse blow with this current problem)

Thank you so much for your help!

AP

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'73 164E/'76 240SW/80 240SW/89 240SW @315Kmiles!

I had a similar no start situation last week. The fuel pump relay box on the later Volvos actually contains 2 relays, the system relay and the fuel pump relay. In my situation turning the key to on was kicking the system relay on but not the fuel pump relay. I was not getting a ground signal to the fuel pump relay from the computer. To test you should check for continuity between the system/fuel pump relay terminals 86/1 and 86/2 and ground with the engine cranking. The terminal numbers are on the back of the relay. I had no ground at terminal 86/2 so I ran a separate ground from the back of the connector at 86/2 to a ground.
Car started right up. If this works for you it might mean your computer is not sending a ground signal to the fuel pump relay ie possibly you have a broken ground connection between the computer and relay. I picked up a used computer from Bob Haire who is on this board. I upgraded from the original 561 to a 951 which is supposed to be a more reliable unit.

Hope this helps.

Thanks for the info. I've been reading around, and some of the prices, used, for a 951 are such that I might as well pick one up anyway. Hopefully, I can run the tests, pop in the 951 and it will start. One question, por favor. I have also been reading here that a bad crank sensor might be keeping the relay from turning on the pump. I had a problem like that back in 2000. I'm guessing that it could perhaps have gone bad in the meantime?? What is the proper name of that device; I have a Bently manual and am having a hard time finding it.

Thanks,

AP
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'73 164E/'76 240SW/80 240SW/89 240SW @315Kmiles!

They call that the RPM signal sensor. A problem there should give you a 1-3-1 fault code. I checked mine by disconnecting at the firewall and checking continuity between two of the three terminals. I had continuity and no fault code so I ruled out this sensor. I assume this is LH fuel injection on a 2.4 motor.

Just wanted to mention two other things, you should have battery voltage (red wire) going into fuse 6.

If you end up solving the problem by attaching an outside ground to terminal 86/2 of the fuel pump relay you are by-passing a Volvo safety feature. The computer will not send a ground signal to the relay unless it detects spark. This prevents you from flooding the engine and also would cut the fuel pump relay in case of an accident which stops the engine. So, if you add an outside ground make sure it is a temporary repair.

Hope this helps.