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Need fuel 700 1989

posted by  shortpoet on  Mon Feb 17 17:17 CST 2003
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Here's my problem. Car was running great. 1989 740 turbo 199,000 miles. Seems to hesitate slightly (real slight) occasionally for a few days before it quit. I put some Techron fuel injector cleaner in and thought that was probably it as I had changed the fuel filter less than a month ago. In a drive through the car started to idle rough and when I tried to drive home it didn't want to go if I tried to give it any gas much past idle. I limped home and the next morning the car cranked ok and ran for about 3 seconds and died. Now it won't crank.

I'm getting spark at the plugs (attached inductive timimg light and tried to crank). I pulled the fuel pump relay and closed the contacts with my fingers while turning the key - no crank. Finally I crawled under and pulled the wires from the fuel pump. Connecting a multi meter to the wires shows 10.9 volts ( battery is a little low from cranking ?) when I try to crank the car. BTW, the cranking sounds the same with the wires unplugged as with them plugged in.

Finally, does this mean my fuel pump is bad? Just wanted someone elses opinion before I open my wallet for it.

Thanks everyone.








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    Need fuel 700 1989

    posted by  mattw on  Tue Feb 18 13:33 CST 2003
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    last visit: Sun Aug 12 12:47 CST 2001
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    Do you mean when you say "it won't crank" that it does absolutely nothing?

    If the things above don't seem to be the problem (hopefully you can gather some sort of intuition before actually replacing each) you might check the relays, especially the one for the injection computer (try swapping a known-to-work one in from a friend's car if you can).

    Otherwise yes, a good way to tell what's up is with guages. Try to get a fuel pres. guage and start there








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    Need fuel 700 1989

    posted by  someone claiming to be rod on  Tue Feb 18 01:33 CST 2003 [RELATED]

    If you got fuel, spark, compression. Maybe a plugged cat.








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    Need fuel 700 1989

    posted by  Chris Mullet on  Tue Feb 18 00:46 CST 2003
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    last visit: Fri Oct 24 09:08 CST 2014
    [RELATED]

    Before spending mega-bucks on things like fuel pump(s), consider a $20 investment in a fuel pressure tester like:

    http://www.toolsource.com/ost1/product.asp?sourceid=http%3A%2F%2Fsearch%2Eyahoo%2Ecom%2Fbin%2Fsearch%253fp%3Dfuel%2Bpressure%2Bguage&dept%5Fid=500&pf%5Fid=58452&mscssid=74UST8918TS92G5S00J74FSANH0V9NF9







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    Need fuel 700 1989

    posted by  dangood on  Mon Feb 17 23:43 CST 2003
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    I had a similar problem, looked at the previous postings, tried several of them until one temporarily fixed my problem...

    The suggestion that did the trick was to give the pump a sharp rap with a blunt object (a 22oz. hammer worked for me).

    At least it bought me some time to shop for a good price on a new main pump so I'm not at the mercy of Checker Auto Parts.

    Be sure to check your in tank pump first, review the FAQ's to make sure it's the pump, and good luck.
    --
    1985 740GLE







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