89 bronco is not getting fuel! HELP!!! [Archive] - FSB Forums

: 89 bronco is not getting fuel! HELP!!!


gates6297
06-06-2010, 08:40 PM
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???

jopes
06-06-2010, 08:43 PM
you try searching? your fuel system has 2 fuel pumps and 2 filters.

gates6297
06-06-2010, 08:49 PM
? 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

BroncoRN
06-06-2010, 09:04 PM
could be PCM relay as well. did u pull codes?

gates6297
06-06-2010, 09:16 PM
pcm relay??? and tried to with the check engine light and could not do it!

jfritts
06-06-2010, 09:16 PM
check and make sure you are getting power to the pumps before you toss more parts at it

jopes
06-06-2010, 09:23 PM
? 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.

sackman9975
06-06-2010, 09:34 PM
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).

gates6297
06-06-2010, 10:47 PM
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!

jopes
06-06-2010, 10:49 PM
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.

SandStallion
06-07-2010, 12:00 AM
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.

dougc767
06-07-2010, 12:58 AM
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)

gates6297
06-08-2010, 06:16 PM
It had both constant power and igniton power!

Spectre
06-08-2010, 06:49 PM
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.

jopes
06-08-2010, 11:19 PM
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.

gates6297
06-09-2010, 12:25 AM
no fuel pressure at all!

Spectre
06-09-2010, 01:21 AM
Did you do like I told you and disconnect the fuel line from the in tank pump to see if gas is squirting out?

jopes
06-09-2010, 06:43 AM
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.

Spectre
06-09-2010, 10:21 AM
True.. My suggestion is one of the basic things to check and if he's ignoring it and not doing it, then :shrug

gates6297
06-09-2010, 05:48 PM
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 !

Spectre
06-09-2010, 06:11 PM
So try changing your fuel pump relay.

sackman9975
06-09-2010, 07:30 PM
So try changing your fuel pump relay.

But he's getting..........
I am getting power to both pumps about 8 volts!

So that rules out the relay unless you have a bad connection. If the relay wasn't working, he'd get 0 volts.

If your only getting 8 volts, then you have a wiring or grounding issue. I had a problem where I was getting a little more than 6 volts at the pump. Ended up being a connector issue. Corroded wires within the plug was the culprit.

Test the power going into the fuel pump relay, and test it coming out see what you get.

Spectre
06-10-2010, 01:40 AM
Good call Sack.. I had forgotten he was getting some voltage..

gates6297
06-12-2010, 07:39 PM
Thanx for all the help so far i just replaced the eec relay and fuel pump relay and she will start for a few but she sounds rough back fireing and not stay started and ideas????