Help identifying fuel pump fuse, '94 D90 - Defender Source
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  #1  
Old May 28th, 2009, 03:51 PM
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Javier Velador
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Help identifying fuel pump fuse, '94 D90

Hey all,

I've searched other posts and found nothing... I need to identify the fuel pump fuse on my '94 D90 before I go out and buy a fuel pump.

Also, in the engine compartment, I have four, large green 30 amp fuses. How do I know these are good since one is for the fuel injection system IIRC.

I smell fuel when I've tried to start it. I've changed the fuel pump relay with no luck still. Lastly, I do see spark at the plugs.

Thanks!
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  #2  
Old May 28th, 2009, 04:00 PM
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Pull each fuse and look for a broken one. That is how I did it
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Old May 28th, 2009, 04:15 PM
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It is the one on the lower RH side of the fuse block in front of the shifter 7.5 amp.

Follow-up Post:

Quote:
Originally Posted by jvelador

Also, in the engine compartment, I have four, large green 30 amp fuses. How do I know these are good since one is for the fuel injection system IIRC.
If you don't have a multi-meter or test light you can pull the maxi-fuses. It is easy to see if they are blown. Its really rare that the maxi-fuses blow though.

Make sure the inertia witch isn't tripped (black box behind the fuse panel in front of the shifter). That will kill the fuel pump too.
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Old May 28th, 2009, 04:18 PM
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I have a fuse tester. It has tow prongs, one of which can be moved in and out to adjust to any size fuse. Great tool to get. Came with a fuse assortment at wal-mart. (or you know, look at the diagram on the back of the fuse box cover ....)
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Old May 28th, 2009, 04:55 PM
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Javier Velador
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Thanks, Keyser and everyone.

Yeah, the inertia switch was not tripped... I dunno about the '95 and '97 tunnel fuse box covers, but the icons on my '94's cover don't identify which is the fuel pump fuse.

I'll try the test light on it tonight.

Thanks again!!
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Old May 29th, 2009, 06:56 AM
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According to the Factory WSM (dated October 93). There at least two fuse you need to be concerned with.

All electrical circuits are fed from the four main fuse box in the engine bay.

The two fuses for the fuel pump:
-- Main Fuse box (Engine bay) -- Fuse D - 30 Amp (bottom fuse). By the way the Main Fuse box should have two 60 Amo and two 30 Amo fuses. (Not all are 30 Amp). Fuse D is Marked for fuel injection.

-- Tunnel fuse box - Fuel pump is fuse number 20 (bottom row, far right)

Also, if your fuel level gauge is working, then he connector between the harness and the fuel pump is connected. The fuel level gauge is a completely different circuit fed by two different fuses. All four wires go through the same connector.

An inexpensive way to check the circuit is two remove the fuel pump relay and put a jumper wire between the two contacts that are connected when the relay is closed. I actually carry a couple of jumper wires I made in case I am in a remote location and a relay fails. (I had a fuel pump relay fail in a remote location a few years back--the root cause of this was a minor sneak path circuit to ground which also caused the clock to not work unless the engine was running and would drain the battery in about two days)
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Old May 29th, 2009, 11:22 AM
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John Crouse
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Registry
Fuel Pump Fuses

Have you also checked the two fuel system relays? They go bad as well.
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