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erratic restart...240 DL '89

I have a 1989 240 DL sedan. I suspect I have some type of fuel delivery problem, but am unsure how to diagnose which component might be the trouble spot. Symptom: On warm days (and we really only notice this on warm days), the car will often fail to restart AFTER it's been driven for a bit. Seems to crank fine -- just doesn't seem to be getting the fuel it needs to get going. I have tried gently clobbering the fuel pump, which may or may not help: the car always eventually restarts, but I'm not sure if it's the fuel pump or something else. Could this be as simple as the fuel filter? How do I know if it's the pump vs. the accumulator? And how do I know which fuel pump (in-line or in-tank) might be the problem part. Thanks!








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erratic restart...240 DL '89 200 1989

The three most commonly fixed items for failure to restart after shutting down (the filling station or convenience store stop) are (1) the fuel pump relay, (2) the CPS, and (3) the fuel pump check valve.

The fuel pump relay, not the pump itself should be clobbered. Well, give it a sharp rap -- it is usually a failed solder joint on the relay supplying current to the pump.

But, if you hear the pump running, it could be the Crank Position Sensor reacting to the heat arising after shutdown. Check for a yellow band on the sensor's wire indicating it is the old, failure prone style. Should be replaced with a white band by now.

Failing that, it is likely to be the check valve, that is a separate part screwed into the outlet of the fuel pump. When it fails, the fuel pressure is not maintained and with lowered pressure, the fuel boils in the rail, sometimes forcing liquid back through the fuel pump so it has nothing but vapor to try to move. The part is Bosch, cheap and separately replaceable. A fuel pressure test will confirm.
--
Art Benstein near Baltimore








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erratic restart...240 DL '89

Check the usual suspects:
1) fuel pump relay
2) crank position sensor
3) 25amp fuse in the engine compartment
4) FI grounds
5) AMM
6) Airbox thermostat
7) coil connections
8) power stage

of course you should check to see if your in tank pump is working.







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