1990 Ford Ranger XLT fuel pump problem - Forums at Modded Mustangs
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post #1 of 23 Old August 6th, 2006, 10:38 AM Thread Starter
 
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1990 Ford Ranger XLT fuel pump problem

Hi and thanx in advance, Ok here's my problem. About a month ago my truck died on me. I took it home I inspected it and i realized that the fuel pump wasn't working at all, my first guess (REPLACE THE FUEL PUMP) So I did! but still nothing, It's like the fuel pump is not getting any electrical power, i rechecked the connectors and everything but still nothing, i checked all the fuses and their all good! Plz any ideas???
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post #2 of 23 Old August 8th, 2006, 03:30 PM Thread Starter
 
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c'mon ppl plz i need some answers
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post #3 of 23 Old August 8th, 2006, 03:37 PM
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post #4 of 23 Old August 8th, 2006, 06:14 PM
 
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does the car randomly die while turned off and sitting in park.....?
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post #5 of 23 Old August 8th, 2006, 08:08 PM
 
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find the inertia switch on the pass side and look at the electrical connector. It could be melted. If so replace the switch and the wiring connector. Or some of the later year models were bad about the connector becoming unplugged fromthe switch. If that's the case, reconnect and reroute the wiring slightly so it doesn't happen again
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post #6 of 23 Old August 8th, 2006, 09:39 PM Thread Starter
 
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Is this the switch your talking about? I'll try to look for it and see what happens thank you very much for all your help guyz, WeCircleTheProblem: the truck doesn't even turn on it's death engine ain't getting no gas at all! the fuel pump is not working and it's brand new.
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post #7 of 23 Old August 8th, 2006, 11:12 PM
 
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no, that's not it. It's located on the passemnger side foot well next to the trans tunnel/cowl panel. It will be a small black box with a white push button on top, with a single electrical connector that has 2 wires going into it.
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post #8 of 23 Old August 8th, 2006, 11:14 PM
 
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post #9 of 23 Old August 8th, 2006, 11:14 PM
 
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post #10 of 23 Old August 9th, 2006, 03:42 PM Thread Starter
 
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well the all data page i could not see seens i'm not a member, anyways thanks:
I found the inertia switch mine has a red button I replaced it and nothing, i bought the fuel pump relay and nothing! now here's my next question! What about the ignition starter switch? i just want to make sure i've spent a lot of money now plz help...
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post #11 of 23 Old August 9th, 2006, 04:35 PM
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Have you actually checked the voltage

Have you actually checked the voltage to be sure you are are are not getting voltage at the pump? I am getting 5-6 volts at my pump, and it is not working, but I ran 12V to it directly, not recomended BTW, and it worked. I was told to check the fuel pump relay, so that is what I am going to check next on mine

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post #12 of 23 Old August 9th, 2006, 04:53 PM
 
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It just showed the location of the switch but you found it. Take a test light or voltmeter and see if you have 12V at the inertia switch connector when the key is turned on or the engine is cranking.
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post #13 of 23 Old August 10th, 2006, 08:52 PM Thread Starter
 
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I checked voltage on the pump connector and no i'm not getting anything checked the inertia switch connector and i'm not getting anything how ever i'm getting 12+ volts on the fuel pump relay connector! going really crazy here any advise?
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post #14 of 23 Old August 11th, 2006, 12:16 AM
 
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here is a diagram that may help.
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post #15 of 23 Old August 12th, 2006, 03:09 PM Thread Starter
 
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Ok i had to take the gas tank down again and i found out that i was getting 12 v out of the pump connector but when i tried to connect the pump it didn't work at all i tried to connect 12 v directly from the battery to make sure the pump was working and it is but when i connect it on the connector it doesn't i connected the pump and a meter at the same time and i realized that every time i connect the pump the voltage drops from 16 v to 1 volt wtf???? going crazy here! i connected to positive directly from the battery and ground from pump connector and nothing i did the same thing the other way around (ground battery and positive from connector) the only way it works it's directly from battery other wise voltage drops to 1 or 0 volts. Now here's my next question:
Can i connect the pump directly to the ignition?
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post #16 of 23 Old August 12th, 2006, 03:19 PM
 
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Sounds as if you have either a bad ground or high resistance in the power wire. CK the inertia switch connector and the pins on the switch itself for signs of melting or corrosion. This would cause the voltage drop you describe and was a fairly common problem on these trucks
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post #17 of 23 Old August 12th, 2006, 03:30 PM Thread Starter
 
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yes actually there is corrosion on on one of the inertia leads what should i do? can i connect it directly from the ignition so that when the ignion goes on the pump does aswell?
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post #18 of 23 Old August 12th, 2006, 05:05 PM
 
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the proper method is to replace the inertia switch and the connector end pigtail. the alternative method that some people do is just to bypass the inertia swich by cutting the wires about 2 inches out of the switch and connecting them together w/ a wiring splice connector.
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post #19 of 23 Old August 18th, 2006, 07:46 PM Thread Starter
 
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Well guyz thank you very much for your help i apritiate your time! I did solve the problem with the fuel pump but it seems to be that the pump is not the problem! damn ranger don't want to start! I'm guessing it's the computer!

Special thanks to:
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post #20 of 23 Old September 2nd, 2006, 01:40 PM
 
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Had the exact thing happen on a 1994 Ranger. It was a bad Bosch relay in the power distribution box under the hood. The problem was intermittent and I chased it for months.
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