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Knowledge about fuel pump priming, anyone? 700

posted by  someone claiming to be Volvouser on  Sun Oct 10 06:04 CST 2004 [RELATED]

I'm helping a friend of mine with an intermittent hard start problem. I have noticed that the 1 second fuel priming function (when ignition key turned to II) is inoperative. It is an '88 with LH 2.4 so it should have this feature. Is an output transistor in the ECU fried, or is a wire from the ignition key to the ECU broken? I have tested the fuel relay in another -88, and it works fine.

Just wanted to know if there is anyone with more experience on this who could share some info. Any input appreciated!








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    Knowledge about fuel pump priming, anyone? 700

    posted by  ndesouza on  Sun Oct 10 07:42 CST 2004
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Sun Mar 18 15:14 CST 2012
    [RELATED]

    It could be due to:

    1. Relay not receiving power from ECU / Ignition.
    2. Pump(s) not receiving power from the Relay
    3. Pump not working
    4. Wiring issues between pumps, relay and ECU
    5. Intermittent problem with fuse 11 (unlikely but...)

    1 and 2 could also be due to a bad connection between the relay-base-terminals and the fuse/relay board. Remove the relay and check the socket for burnt plastic etc. When this happens, the socket-terminals get pushed in and result in a bad-connection (if any) with the relay.

    You can understand / fix this problem better using a 2.4 wiring diagram. If you dont have it, click here and search for 2.4 - you will need to scroll down a couple of pages.

    Noel







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      Knowledge about fuel pump priming, anyone? 700

      posted by  someone claiming to be Volvouser on  Sun Oct 10 09:18 CST 2004 [RELATED]

      Excellent!

      That was exactly what I was looking for. Will dig into it tomorrow!
      Thanks again Noel!








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    Knowledge about fuel pump priming, anyone? 700

    posted by  porkface on  Sun Oct 10 06:57 CST 2004
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    last visit: Fri Oct 24 09:12 CST 2014
    [RELATED]

    if the car is an 88, it's lh 2.2.

    if it's really an lh 2.4, then it's an 89 or newer.

    does the fuel pump run when the engine is cranked? i've seen alot of cars that do not prime with every key twist but always run the pump when cranking. good luck, chuck.








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    Knowledge about fuel pump priming, anyone? 700

    uid 18083's pic
    posted by  lucid on  Sun Oct 10 06:30 CST 2004
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    last visit: Fri Oct 24 12:31 CST 2014
    [RELATED]

    I know these "first used in" (year) things can be uncertain, but are you sure the '88 700 has LH 2.4?

    I ask because the Bosch Injection Products catalog of 1992 shows the first 740 with an 016 AMM to be the '89 (same as 240). All '88 700s are listed as having the 007 AMM (LH 2.2, no Key On prime).

    Does this car have the crank position sensor, OBD I Fault Code display, 016 AMM etc.?
    --
    Bruce Young
    '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.








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      Knowledge about fuel pump priming, anyone? 700

      posted by  someone claiming to be Volvouser on  Sun Oct 10 07:02 CST 2004 [RELATED]

      Yes, its a 2.4!!

      Obviously, here in Sweden Volvo began using the 2.4 earlier. It has the OBD feature and no tuning screw for the AMM (016).

      Now, when that is sorted out, do you have any ideas about the original problem, ie priming?!








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        Knowledge about fuel pump priming, anyone? 700

        uid 18083's pic
        posted by  lucid on  Sun Oct 10 08:17 CST 2004
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Oct 24 12:31 CST 2014
        [RELATED]

        OK—sorry!!

        "Obviously", if I had somehow miraculously realized you were in Sweden, I would not have dared question your assertion as to the LH vintage.

        Care to disclose any other secret information that might help sort this out?!
        --
        Bruce Young
        '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.








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          Knowledge about fuel pump priming, anyone? 700

          posted by  someone claiming to be Volvouser on  Sun Oct 10 09:25 CST 2004 [RELATED]

          Sorry Bruce, didn't mean to offend you. "Obviously" was obviously (haha) not a well chosen word. I blame it on my not being a native English speaker.

          Got a nice schematic from Noel which hopefully will sort things out. What I was hoping for was that one of you guys immediately could pinpoint the origin of the fault so that I didn't have to dismantle the whole car to find the cause.

          Thanks indeed for your assistance!








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            Knowledge about fuel pump priming, anyone? 700

            uid 18083's pic
            posted by  lucid on  Sun Oct 10 09:44 CST 2004
            Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
            last visit: Fri Oct 24 12:31 CST 2014
            [RELATED]

            Good luck then.
            All I can offer is that there is no external signal to the Fuel Relay except for the ECU-controlled relay ground from ECU 20 (Yellow/Black) to Relay 86/2. So I assume the "priming" control is governed by ECU logic.

            --
            Bruce Young
            '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.







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