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remote rescue, fuel pump 700 1987

posted by  Palmer on  Mon May 22 10:40 CST 2006
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last visit: Fri Jan 18 15:37 CST 2013
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Hi all,
My 87 740ti failed on the way home from a day trip yesterday. About 50 miles away from home, it would cut out intermitantly and just for a short time, regaining fire and running normally. It was worse on a long uphill, but made it, low fuel I figured. so I filled her up (only 11.5 gal) and off we go. It goes about 5 miles and stalls completely. Fuel starvation I recon. I check the FPR and it's cliccking, but I put in my spare anyway. I pull the AMM wires, it starts right up. OK, even though it doesn't make sense, I swap in my good 007 spare. It starts and runs normally. 5 more miles, stalls again. No fuel in fuel rail. no spare fuel pump either. call for help. Finally my question, what should I take besides the fuel pumps (both), a new filter, and tools. The car has a fresh hall sensor in distributor, no RPM sensor. Does it have a radio suppression relay? if so, where? I'll be going to get her tomorrow after work, any encouraging words are appreciated.
Palmer
--
1994 944na,1987 745ti, 1989 244, 1995 960, 1980 265 V8 sold








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    remote rescue, fuel pump 700 1987

    posted by  Rolyak on  Mon May 22 14:58 CST 2006
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    last visit: Fri Oct 24 08:03 CST 2014
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    My 87 TI also had a similar failure, first of all is your tach bouncing as you try to start it? If yes, you probably have spark.
    Can you hear the main pump kick in just as you engage the starter, if yes then it might be the RSR relay. Mine have failed twice and I keep a freshly soldered one in the glove box.
    Mine is located on the drivers side strut tower, some have two, the other is for a fan relay I think.
    Another poster says you can jumper the two larger wires (there are 4 total) and eliminate the relay. Have no experience as of yet however I looked at wiring diagrams and it appears feasible.
    Also the connector for the RSR relay may be like mine and is deteriorating so take a jumper wire just in case.

    What condition is the engine wiring harness, any crumbling ground wires?








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      remote rescue, fuel pump 700 1987

      posted by  Palmer on  Tue May 23 04:29 CST 2006
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      last visit: Fri Jan 18 15:37 CST 2013
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      The harness isn't too bad,crumbly wise. The PO had given it some attention and it has a couple of new wires spliced in, I'll check that too.Thanks for the tip on bouncing tach, I recall it did bounce on crank, but my memory.....

      Thanks, Palmer








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    remote rescue, fuel pump 700 1987

    posted by  Aye Roll on  Mon May 22 12:48 CST 2006
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    last visit: Tue Oct 14 21:08 CST 2014
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    You have to know whether you're getting spark. Pull the coil wire off the bottom of the dist cap and see if it makes spark when it cranks.

    If so, then it's almost certainly on the fuel side of things.

    If not, you have to revisit your dist hall sensor, and also think about replacing the coil. If you have a spare, bring it.

    Good luck with it!
    --
    Rob Bareiss, New London CT ::: 87 244DL, 88 245DL, 90 745GL, 84 242DL project, 89 244 parts, 88 244DL to replace the 87








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      remote rescue, fuel pump 700 1987

      posted by  Palmer on  Mon May 22 13:30 CST 2006
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      last visit: Fri Jan 18 15:37 CST 2013
      [RELATED]

      Thanks for the response, I'll bring a coil. I am almost certain it's not a spark isuue, when it was starting to go, it was not like an electrical mis-fire.
      Palmer
      --
      1994 944na,1987 745ti, 1989 244, 1995 960, 1980 265 V8 sold







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