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Ecu and Fuel Pump
Posted 12 January 2005 - 05:26 PM
Which brings me here with my question. Does the ECM have anything to do with controlling the electricity to the fuel pump?
The reason I ask is that, is if any one remembers back about a month and a half ago I had a post asking about a fuel pump fuse. To make a reallllllllllly long story short, there is no fuel pump fuse just a relay, turns out it's working fine clicking like a mofo, so we turn to the fuel pump. Pulled it out and went and got a brand new one. Put it in and car still didn't run. So that's where I'm at now and have been at for the past month or so.
I've been able to talk to a few people about my problems with my car and one of the suggested that the car may have a "rollover sensor" witch may be stopping the fuel pump form working. This makes sense to me because before the car was fine and it had just suddenly stop working after doing routine maintenance in which the car partially fell of one of the ramps.
I have both Chilton's and Hayne's books neither of witch mention anything close to a rollover sensor and my best guess would be that the Ecu controls the fuel pump. I'm at a 100% loss at this point and have no other direction to turn and would be very grate full for any type of response at this point.
Posted 12 January 2005 - 08:40 PM
The rollover valve is mechanical, and not electronic, so it's probably not that. Have you put a tester on the fuel line to see if there is any pressure at any time?
Posted 12 January 2005 - 08:44 PM
Does the fuel pump run? Can you hear it when the ignition is switched to the ON, but not crank position?
IF yes, check the fuel filter and pressure regulator.
See if the injectors are getting gas. Be careful.
IF no, is there juice to the pump connector at the pump.
IF yes, check for continuity of the motor. Then take it out and hook it up to 12 Volts and see if it runs for a second.
If no, start checking continuity back to the relay.
I don't see how the ECU would stop power to the pump but it probably is tied to the canister purge valve and pressure regulator.
The fuel system appears to be relatively simple. Are you getting any codes?
Posted 12 January 2005 - 08:50 PM
Posted 12 January 2005 - 09:06 PM
You may want to check the connector for the fuel pump which is under the rear seat lower cushion (on the passenger side ) there is a connector there (that for some reason on turbo's) tend to burn and cause an open circuit
Hope this helps
Posted 12 January 2005 - 10:55 PM
Posted 13 January 2005 - 03:16 PM
Posted 13 January 2005 - 03:24 PM
When you measured the voltage to the pump did you measure across the wires to the pump only and not to ground? If you didn't, then you need to do it that way.
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