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Fuel pump (tank) always runs, where to start repair? 200

posted by  mkoch on  Sun Oct 6 18:40 CST 2013
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last visit: Sat Sep 13 18:04 CST 2014
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I have a 1989 Volvo 240 Wagon, automatic transmission.

You can see from the picture of the fuse box, that some electrical modification has been done by a differently gifted individual.


[URL=http://smg.photobucket.com/user/weimadog/media/photo6_zpsd95777ed.jpg.html][IMG]http://img.photobucket.com/albums/v493/weimadog/photo6_zpsd95777ed.jpg[/IMG][/URL]

http://img.photobucket.com/albums/v493/weimadog/photo6_zpsd95777ed.jpg

With the ignition switch in the "on" position, engine still, and fuse 4 in place, fuel pump relay in place, both fuel pumps run. The car will start when cranked.

With the igniion switch in the "on" position, engine still, fuse 4 removed, fuel pump relay in place, the MAIN fuel pump does not run, but the TANK fuel pump does run. The car will start and run when cranked in this condition.

Now things get interesting.

With fuses 4 and 6 removed, and the wires to the tank fuel pump disconnected, the main fuel pump does not run with the ingintion on and engine stil. The car will start and run like a normal Volvo if cranked.

So, right now, I have the tank pump disconnected so it will not continue running in the event of an accident. Fuses 4 and 6 are removed. Fuel Pump Relay is in place. The engine will start and run in this condition. (In this configuration, when the engine is off, and the ignition on, I can turn on the main fuel pump by putting in fuse 4).




I have already replaced the fuel pump relay, so I am sure there is nothing wrong with it.

Is any of this normal?





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