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The Haynes repair manual says it is under the instrument panel forward of the center console. However, they do not indicate or show any pictures as to how you get to it, what it looks like, or how to check if it is working properly. Any help on this would be great.

Update:

On most 94 GMC's the relay is in the engine compartment on the passenger side. It is a small gray or black box with 5 wires connected. The wires are orange (hot when key is on), red (test wire for fuel pump), black/white (ground), green (control from ECM), and grey (to fuel pump). Are you sure you need a new relay? One way to test is to use an OHM meter to check for resistance between the E and C connectors inside the relay. There should be very little resistance between these connectors.

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โˆ™ 2008-04-12 23:25:24
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Q: Where is the fuel check valve located on a 1994 GMC Sonoma?
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