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Discussion Starter #1
I just bought a 89 bronco i thought it was the fuel pump i repalced it and the fuel pump relay but she is not priming! fuel pressure test resulted in no pressure! I checked the inertia switch to but still nothing! what could make it do this???
 

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you try searching? your fuel system has 2 fuel pumps and 2 filters.
 

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Discussion Starter #3
? it has two pumps one in tank thats the one i replaced and one on the frame rail. only one filter right after the pump on the frame
 

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could be PCM relay as well. did u pull codes?
 

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check and make sure you are getting power to the pumps before you toss more parts at it
 

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? it has two pumps one in tank thats the one i replaced and one on the frame rail. only one filter right after the pump on the frame
there is another filter between the 2 pumps.
 

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could be PCM relay as well. did u pull codes?
pcm relay??? and tried to with the check engine light and could not do it!
PCM relay = EEC relay

Chances are if you couldn't pull the codes, then your EEC relay is at fault. The EEC relay supplies the power to the fuel pump relay. Check the fuel pump relay for constant power and ignition power (supplied by the EEC relay).
 

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Discussion Starter #9
I am getting power to both pumps about 8 volts! and no just one filter! tried to test the pumps off the eec but nothing happened!
 

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I am getting power to both pumps about 8 volts! and no just one filter! tried to test the pumps off the eec but nothing happened!
hey, your right, wtf do I know about broncos. I mean being around them for over 15 years, I am still just learning where the ignition key goes.
 

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if there is only 8v going to the pump or pumps, i think filter location or quantity is irrelevant. have your battery load tested, and make sure the connections are clean. then start checking voltage input and output at your EEC and Fuel Pump relays. Bad contacts inside of a relay can cause a voltage drop. If you have low input voltage to the relay your going to be looking at a resistance problem in the wiring.
 

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I was only getting 7.xxx amount of volts back at the pump. I also had the same going into and out of the fuel inertia switch. So, I jumped it at the EEC test connetor and it still wasnt working. Then went further on and cut the + and - wires a foot or so before the pump and spliced directly to the battery. Pump still did'nt work, so replaced the in tank pump and what do ya know....works like a champ. I dont have any other electrical issues, so idk, maybe theres some sort of resistor in the relay. :scratchhe(I replaced it twice while I was dealing with my pump issue)

Edit: After thinking about that overnight, the lower voltage was probably the result of the bad pump. (fried pump, fried internal connections)
 

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Pull off the line after the in tank pump and blip the key. See if the pump is pumping.. If it is do the same thing at each connection in the fuel line until no fuels comes out.
 

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if your not getting full 12 vdc to both pumps you will never get enough fuel pressure.

you can check your fuel pressure at the fuel rails on the engine.

if you have 40 psi and both pumps are getting 12vdc you have something other than a fuel problem

if you have 12vdc at both pumps and both are running, but still do not have 40 psi or any pressure, you either have a bad fuel regulator, no fuel in your tank, or a plugged filter.
 

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Did you do like I told you and disconnect the fuel line from the in tank pump to see if gas is squirting out?
 

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Did you do like I told you and disconnect the fuel line from the in tank pump to see if gas is squirting out?
he is better off taking it to a mechanic who might know what he is doing.
 

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True.. My suggestion is one of the basic things to check and if he's ignoring it and not doing it, then :shrug
 

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Discussion Starter #20
nothing is squirting out bud! and it will if i hot wire it from battery to fuel pump on fram rail! both will squirt out !
 
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