fuel pump relay acting weird

[laidbback]

my bronco has been my daily driver for the past 2 years and today it decided not to start. It cranks but doesn't fire and I couldn't hear the fuel pump when i turned the key half way. I had an issue with a wet fuel pump relay before so I put in a spare and turned the key half way and the pump went on and stayed on and wouldn't cycle off and still no start. I have fuel at the shrader valve on the hard fuel rail. I just bought a brand new relay and it's acting the same as the one that i had in there and the fuel pump isn't making any noise. I know it's something to do with the relay or pump. I think? Any ideas?

 

[broncnaz]

I vote its a pump issue probalby done took a dump on you.

 

[Viperwolf1]

Unplug the wire from the pump and hook it up to a testlight. See if it acts normally. If it does either the pump is bad or the pump ground is bad.

 

[ransil]

a wet computer can cause this problem, does your bronco leak where the computer is mounted. Mine did this once , I just pulled it and threw it in the oven for 1 hour at 140 degrees, this was right after a trip home from an event, if you wait too long the moisture will create corrosion and you will be screwed.

 

[laidbback]

I just tried putting in my spare pump that I know works and still nothing. I guess I need to wait for someone to come over so I can test the relay and wire going to the pump because I can't turn the key and test it quick enough. I really hope it's not in the computer because I wouldn't know where to start. The weird thing is that one spare relay I plug in and when I turn the key the pump stays on (doesn't cycle off after a few seconds) and the brand new relay and the old relay don't do anything when i turn the key.

 

[broncnaz]

Now it sounds more like a wiring issue hopefully its not the computer but I would run through all the wires going to the relay to make sure they are good.

 

[ransil]

If the relay got wet the relay socket probably got wet check the connections for corrosion.