Fuel pump or pcm

[93BlueDemon]

I thought I had a fuel pump problem but now I’m wondering if it could be pcm related
I disconnected fuel line no fuel no air hisses out
Turned the key nothing…. About 10 seconds later the pump came on and squirted fuel continuously not stopping. I tried doing a koeo test. All I got was 3 quick flashes then a constant check engine light. I can hear the pump running continuously anyone have any idea what could be going on here? To my knowledge it’s the original pump with 220k miles on it

 

[Rick]

With the fuel line disconnected I don't think the pump will turn off since it doesn't sense pressure. Connections in the relay box under the hood can become corroded over time, in harsh environments. I would check there.

 

[Turdle]

Could be a bridged fuel pump relay. Tap on it to see if it'll shut off.

 

[Turdle]

With the fuel line disconnected I don't think the pump will turn off since it doesn't sense pressure. Connections in the relay box under the hood can become corroded over time, in harsh environments. I would check there.

I thought the prime cycle was timed. Might be wrong

 

[Turdle]

Which year explorer? If 93, remove pcm and look inside. I believe the problem will be obvious if there is one. The capacitors in the fuel pump circuit may be leaking or swollen out of the plastic shrink label

 

[93BlueDemon]

Fuel line is connected now pump still runs continuously maybe just not building enough pressure. I was pretty sure it would be the pump until I tried doing the koeo after that wasn’t working I thought it could be pcm related

 

[Turdle]

Try relay first. Swap it with another one ,

 

[93BlueDemon]

I’ll take the pcm out and have a look at it.

 

[93BlueDemon]

How would you go about opening the pcm up without damaging it?

 

[Turdle]

Picture please


You never answered which year this explorer is

 

[93BlueDemon]

It’s a 1993

 

[93BlueDemon]

Tested my fuel pressure. It slowly climbed up the gauge to 20 after trying to start it went down to 10 so I’m guessing my pump just isn’t putting out enough pressure

 

[93BlueDemon]

Looks like it might be the pcm after all. Too bad I already dropped my fuel tank. I opened up the pcm and it smells like burnt electric all three blue capacitors have discolation around them and one was barely still connected

 

[Turdle]

Looks like it might be the pcm after all. Too bad I already dropped my fuel tank. I opened up the pcm and it smells like burnt electric all three blue capacitors have discolation around them and one was barely still connected

Haven't repaired one myself, but several people have. Do you have soldering skills?

 

[93BlueDemon]

Looks like it might be the pcm after all. Too bad I already dropped my fuel tank. I opened up the pcm and it smells like burnt electric all three blue capacitors have discolation around them and one was

barely connected

 

[93BlueDemon]

Never done any soldering but I am employed as a welder. Rockauto has pcms for around 100 dollars. I might go that route take the gamble. another 1993 5 speed no egr computer will probably be hard to find all the junkyards around here don’t have much explorer stuff

 

[Turdle]

Never done any soldering but I am employed as a welder. Rockauto has pcms for around 100 dollars. I might go that route take the gamble. another 1993 5 speed no egr computer will probably be hard to find all the junkyards around here don’t have much explorer stuff

If you want to try, I'd attempt the repair. No charge. I'm good at that kind of thing.

If you can acquire the needed capacitors, ship it to me.

First though I would like to see both sides of the circuit board.

I bet they are available on ebay, also might be a repair service there

 

[93BlueDemon]

 

[Mbrooks420]

Looks promising.

 

[Turdle]

That looks very accessible for component replacement.

Earlier in life I used to place those tiny rectangle surface mount components for a living. I placed about 10,000 per day, by hand and soldered them in place. Resume good for you?