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Fuel Pump Relay Quick Question!

posted by  someone claiming to be Blake on  Tue Nov 3 10:01 CST 2009 [RELATED]

Howdy Bricksters,
Real quick question! So the fuel pump relay, it should click on for the first few seconds when you click the key on, then click off, ok good. Then when the motor starts and is running, it should remain energized correct? It should not click on and off? Cause after all, it's not regulating anything, riiiiight?

Thank in advance,
Blake








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    Fuel Pump Relay Quick Question!

    posted by  KlausC on  Tue Nov 3 16:20 CST 2009
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    If your car is idling with the relay in place, it is working. The relay will turn off the fuel pump if your car goes upside down, and probably a few other things as well. It is not a 'dumb' relay.

    Klaus
    --
    Proud owner of a 220S. If I had more room, I would have more Volvos.








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      Fuel Pump Relay Quick Question!

      posted by  someone claiming to be Blake on  Sun Nov 8 09:40 CST 2009 [RELATED]

      So if that the case, what is stopping me from just jumping it out? The car seems to have two relays for the fuel pump. When the car is in the "off" and "acc" position, no power is supplied to the fuel pump (when it is jumped out). When I switch to "on" or "start" power is applied to the pump (still in the jumped out phase). So really, is the relay only for the 2 second phase to prime the fuel system (when you first turn the key to "on" but not starting the car) then when the car is running, remains energized? Seriously, what is the point of the relay, short of it turning it self off when switched to "on," when the car isn't running (or stalls out), It's kinda like a oil pressure switch in my mind then. I ask this cause my relay is shot, and honestly, it would be cheaper for me to add an oil pressure switch then buy a new Volvo relay (6 bucks vs 48). Always did like improving (simplifying) everything mechanical, so I can bring the 850 back to the KISS principle (Keep It Simple Stupid).
      Thanks,
      Blake








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        Fuel Pump Relay Quick Question!

        posted by  KlausC on  Sun Nov 8 10:49 CST 2009
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        Nothing can stop you from direct wiring the fuel pump or replacing the FPR with a relay not designed to the task. And if you think your safety is only worth $30, you probably ought to trade in your Volvo for a Yugo.

        If, for some reason beyond your control, your car's engine stops and the fuel pump keeps on working and the first responders stand back and watch it burn, don't blame others. The fuel pump can empty your full tank in less than 1 minute.

        Klaus
        --
        Proud owner of a 220S. If I had more room, I would have more Volvos.








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    Fuel Pump Relay Quick Question!

    posted by  someone claiming to be Blake on  Tue Nov 3 10:12 CST 2009 [RELATED]

    Now before anything is said, it has a new pump, filter, and about 5 feet of line. It seems as the relay is going in and out, have already re solder everything and replaced the capacitors. If I jump it out, works fine. I'm just wondering since I watched the relay click on and off as the car was idling, thought all my connections were clean also. But the fact the relay has a freaking I/C makes me wonder if it does other things...







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