At first the truck wouldn't start, no fuel. i figured fuel pump. I replaced the fuel pump. now i find that the fuel pump fuse keeps blowing. i get the truck turned over it runs for about a second the fuse blows. i replace the fuse with the blower fuse. both work fine. i thought i found a wiring problem. i disconnected the underbody frame rail wiring harness, looking for a short. i check and find that in this section when i touch two pins together i get a beep with my multi meter, meaning theres a short. i cant see a short. now i'm thinking its one of the pins. i have no clue from here. The truck was warming up, i left to go inside the house, come back out five minutes later and the truck was off. radio running. thats how the whole problem started. and help would help!! if you could email me you could save my life lol. thanks
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Re: 1993 ford explorer fuel pump fuse keeps blowing
Josh. The best and safest way to find a short is to find it. But, the fuse wonwon't give yo time. So, Let's create time and replace the fuse with an aitomatic fuse/circuit breaker. It will cycle automaticly until you locat the problem. When yo locate the short it will quit cycling.. Just put it in place of the original fuse and listen. Do not exceed the original fuse capcity. they are available at autoparts stores. good luck and if this helps, fill our the questions fixya asks. please
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You have a short to ground on that circuit ,the only way to find it is to find a wiring diagram an see what all gets power from that fuse .Then isolate each circuit until the fuse doesn't blow any more . Go to youtube an check out some videos on finding a short on automotive wiring . Also I suggest you check out some videos on basic automotive electrical trouble shooting . Finding an fix automotive electrical shorts is best left to a automotive electrical repair shop !
The most common cause of this is that the fuel pump is drawing to much current due to wear and a possible burned fuel tank connector at the tank. To replace the pump you must raise the truck up and remove the fuel tank. Also replace the fuel filter which is on the inside of the frame on the drivers side. Use a rag to cover the fuel line when disconnecting it with the required special tool.
I'm no expert but when you turn key to run position, this turns the fuel pump on if the pump is faulty i would think it would blow the fuse also. Or its your theory a short in the ignition system wiring.
Turn the key over as far as it will go without starting and quielty listen for the fuel pump buzzing in the tank. If you don't hear then it is most likely the fuel pump. I would check the fuse first before having it replaced though. There should be a fuse for it in the panel.
If it takes more than a couple of hours to blow the fuse its most likely the fuel pump. If it blows instantly you could have a grounded out feed wire (+) wire or a bad relay. Look in the haynes manual to get the location of the relay.
sounds like you have a bad relay that is shorted out or you might have a bad fuel injector shorting out fossible fuel pump wireing short do some probing aroun with the multi meter try to find direct short , use the process of elimination .
now let me see does your truck start up and run then fuse blows? is the fuse the correct amperage check your owners manual to see how long does it run before blowing fuse ? when its running is it running smooth while is running?