Question about 1992 Isuzu Rodeo

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I have no power to the fuel pump. Replaced the pump, checked fuses, and swapped relay switches still no power.

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I suspect a worn out or dirty contact base on the ignition switch. Most Japanese ignition switches consist of two parts the key tumblers and a removable/replaceable contact base where all the electrics of the switch are kept. Many times this part can be taken off cleaned and put back in. If your vehicle has high miles you may be better off just replacing it.
Unfortunately there is the the possibility that you just have a wire that is broken inside the insulation or a bad plug end on one of the wires. this type of problem can be easy to bypass but hard to find. Did you bench test the fuel pump before installing it?

Posted on Nov 06, 2010

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You may have a defective ignition starter switch, it is common in this year. When the switches go bad you loose power to the fuel pump circuit that power the relay.

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Hello, There is a fuel pump Relay in the Powerbox under the hood. The system works this way. When you turn on the Ignition switch, it trips the Fuel pump Relay. The power is routed to the fuse from the Relay and then to the Inertia (safety) cutoff switch. Finally the power reaches the Fuel pump.

You need to test the fuse holder for power before it flows through the fuse. You should have the Ignition on, in order for the Fuel pump Relay to provide power to the fuse. Although the fuse may be good, it can not work without power.

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If the fuse is good can you hear (and feel) the main fuel relay clicking when the ignition key is cycled on and off? There may be another relay that is the same on the board, if so swap it over temporarily. If relay is working, is there power at the connection to the pump. If not then the wiring is broken. If there is then the pump needs to be replaced

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Did you check the fuel inertia switch in the passenger side kick panel ?

The fuel pump is powered :
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The fuel inertia switch to the fuel pump itself.

At the fuel inertia switch in the kick panel, power from the relay is the Dark Green w/ Yellow stripe wire and the pink w/ black stripe wire is the power. from the fuel inertia switch to the fuel pump.

If you jumper the fuel pump relay, you should hear it run. If not pull the fuel pump relay, and check the pins in the relay socket, pin 30 should be the power from the fuse.

50b0c31.jpg

If you have power at pin #30, jumper the relay socket as shown with the red line above, and check the dark green w/ yellow stripe wire at the fuel inertia switch for power.
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https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

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Fuel pump relay


In the fuse box, (under the hood), lower right corner. C1051....if you think its bad, there are others like it in the fuse box you can swap with. If the fuel pump doesnt work, be sure to check the INERTIA SWITCH. I cant tell you how many fuel pumps are replaced because no one checked that switch. If the Inertia Switch is good, have someone rap on the bottom of the fuel tank while you are cranking the engine over, if it starts then, the fuel pump is bad.

Nov 19, 2009 | 2003 Ford Explorer Sport

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Their is no sound coming from the fuel pump does this mean its broke is there a fuse ? i don't have the booklet its turning over but not getting any gas


It could be a few things. First thing is to check the fuel pump relay.

Power Distribution Center Located under the hood, in the engine compartment. It houses the fuses and relays for most of the under hood components which are not controlled by a dash mounted switch (such as the alternator, fuel pump, ECM, etc.). The fuses and relays are replaced in the same manner as the fuse panel inside the vehicle. The power distribution box cover is hinged on one end and utilizes a retaining latch on the other. Simply release the latch and lift the cover up to gain access to the fuses and relays.

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I know this picture is small but this is your power distribution box in the engine compartment. The fuel pump relay is the second square relay from the bottom. You see the two rectangular ones and then the two square ones, the fuel pump relay is the fourth one in that row. Compare the numbers on the relay, you should be able to swap it with a new one no problem.

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88 thunderbird turbo coupe fuel pump


have you checked all fuses under the hood? have you checked the fuel pump relay? you may be able to swap the fuel pump relay with amother relay in the fuse box.are you getting power into and out of the reset switch? from there it goes to the fuel pump. if power is getting to the fuel pump and it has a good ground, the the pump is bad.

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