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740t transfer pump in a 240t? 200

posted by  madnicholas on  Mon Apr 25 18:54 CST 2005
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last visit: Sun Jan 15 22:39 CST 2012
[RELATED]

So my 82 242 GLT needed a new transer (in-tank) fuel pump and my neighbor had one that he bought for his 740 Turbo. I installed the pump and now my car runs WAY rich. Thick black smoke out the pipe. I set my base mixture with a dwell meter and it's fine till I plug in my Oxygen sensor. I have to richen the mixture to keep the car running (stalls like it's too lean with the sensor pugged in.) Question is, could the transfer pump be pumping too much fuel? Or does my sensor need replaced?

Thanks!
--
1982 242 GLT 245k mi: 1985 245 205k mi.








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    It's not the pump -- this is a routine swap 200

    posted by  Ken C on  Tue Apr 26 17:11 CST 2005
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    last visit: Fri Oct 24 11:39 CST 2014
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    It's routine for 240 owners to upgrade to a 700 pump. IPD explains how to do this (it requires some modification to the pickup tube because the 700's pump is longer); but there's never been any mention of this job affecting fuel delivery to a point where such adjustments are needed. The 700 pump's benefit is purely to ease the load on the main fuel pump, and lessen any vapor lock.

    Also, the prepump (even the 700's) hardly generates enough pressure to cause this problem -- certainly, it would be moderated by the main fuel pump farther downstream.







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    740t transfer pump in a 240t? 200

    posted by  Bob Wennerstrom on  Tue Apr 26 02:39 CST 2005
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    last visit: Fri Jul 15 12:01 CST 2011
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    I think the problem is not in the fuel pump. I've got a 740T in-tank pump in my 245T and have never had a problem running rich.
    --
    Volvo Farmer:

    21 Volvos '58-'91

    445-544-122-144-1800-240-740

    sorry, no FWD








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      740t transfer pump in a 240t? 200

      posted by  mbliss on  Tue Apr 26 08:54 CST 2005
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      last visit: Tue Oct 21 20:49 CST 2014
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      Me too. Maybe the car was adjusted to compensate for inadequate fuel delivery before you installed the pump? I'd check the basic settings under the hood first.

      --
      '81 GLT 245 @ 259K; '83 DL 175K








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        740t transfer pump in a 240t? 200

        posted by  someone claiming to be hardknocks1 on  Tue Apr 26 14:19 CST 2005 [RELATED]

        i also have the 740 in tank upgrade, no problem.







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