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Posted on Jan 02, 2017
SOURCE: 2004 Audi A4 3L won't start
the problem is not the relay switch the problem to me sounds like the fuel filter needs to be replaced so i wouldnt be messing with the relay switch because the relay switch would be harder to replace.
Posted on Aug 19, 2008
Are you certain that the fuel filter isn't bad and leaking gasoline?
There is a cheap plastic locking mechanism holding the fuel filter inline with the outlet side of the filter. Mine went bad and started leaking fuel everywhere i went. Especially when I was stopped at a light for a long period of time. A cheap tool can be bought at any automotive parts store to remove the old filter , you will need the tool to install a new filter.
If the filter is okay then I would just disregard my post.
Posted on Sep 13, 2009
You don't have one on there. Pump is turned on and off by the automatic shutdown relay and the pump relay. The crank sensor signal keeps it on. If the asd relay does not get a signal from the computer (from the crank sensor), it turns off the pump relay (and spark).
The pump should run when you first turn the key on. When you start the engine, if the computer gets no signal from the crank sensor it will shut the engine off (no fuel, no spark = off)
If when you first turn the key to on, you can't hear the pump, likely either the pump has failed (check power at the pump harness) or the relay is bad.(swap relay for a known good one and try it).
Posted on Apr 17, 2010
Believe the AC compressor Relay is located on the left side of the Fuse block inside the passenger kick panel. Exact location is in your owners manual.
Fuel pump relay is inside of the Engine Fuse block under the hood on the passenger side. Locations are written inside of the lid.
Posted on May 15, 2010
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Nov 20, 2017 | Cars & Trucks
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