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Old 11-19-2012, 10:53 PM   #1
bayouvol
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92 bronco fuel pump

My fuel pump is running continuously. I have replaced the regulator and I am going to replace the relay next. Is there anything else I need to look for or change?
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Old 11-20-2012, 02:45 AM   #2
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Stop replacing things. Does it run with the key OFF?
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Old 11-20-2012, 01:45 PM   #3
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The fuel pump should run for about 3 seconds when key is turned on then shut off until the engine is running. if it runs with the key off you have a wiring or relay problem. if it run with the key on but engine not running then it could be a pcm problem or wiring. Find the fuel pump relay and run some checks there first such as when you unplug the relay does the pump stop?
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Old 11-20-2012, 02:57 PM   #4
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yo,
Also
Fuel Pump Runs w/Ignition Switch Off in 84-95; or after grounding the FP terminal at the Diagnostic Link Connector (DLC);
FP relay and or EEC power relay is stuck closed; do accessories (radio, etc.) turn on when turning key to accessory or run positions? if not; The ign switch actuator and or switch needs to be adjusted; a timer circuit in the PCM will open the ground circuit to the fuel pump relay, causing the fuel pump relay contacts to OPEN; if PCM is burnt & inop now, the timer circuit will not open the FP relay and pump will continue to run
Source: by miesk5 at Ford Bronco Zone Forums

If Horn works, swap horn relay in-place of FP relay, if still same, swap it into EEC relay
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Old 11-21-2012, 01:29 PM   #5
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Latest, I had the relay and regulator (which had never been changed) so I changed them anyway. The fuel continues to run with key on. Someone said fuel pump itself may be bad and someone else said PCM. How can I check and is there anything else? I am not real mechanically inclined but I can follow directions. Thanks for your help.
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Old 11-21-2012, 03:41 PM   #6
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Here's how the fuel pump circuit should work:
When the ignition is initially turned, the PCM (ECM) will energize the fuel pump relay and run the pump for about 2 seconds and then stop the pump. This is to prime the fuel rail.
Once the PCM (ECM) sees pip signals (indicating the distributor is turning), the PCM starts the fuel pump again (by energizing the fuel pump relay). The fuel pump runs as long as the PCM is seeing the pip signals. The pump is not "told" to stop as long as the PCM is seeing pip pulses (the crash switch will open the circuit to the fuel pump, but it is the crash switch opening the circuit and not the PCM causing the pump to stop).
The fuel pressure regulator only regulates the fuel pressure (duh), it does not start/stop the pump on pressure changes.
Now, if on initial key on, the pump starts, and continues run for more than about 2 seconds, it is either being told to run by the PCM (PCM failure), or the fuel pump relay energizes and stays energized because of a failure of the relay.
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Old 11-22-2012, 12:55 AM   #7
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Quote:
Originally Posted by bayouvol View Post
...the relay and regulator (which had never been changed) so I changed them anyway.
Bad move - OE parts are generally better than new aftermarket. I hope you kept the originals.
Quote:
Originally Posted by bayouvol View Post
The fuel continues to run with key on.
The question was: what does it do with the key OFF?
Quote:
Originally Posted by bayouvol View Post
Someone said fuel pump itself may be bad...
Not likely since IT'S RUNNING.
Quote:
Originally Posted by bayouvol View Post
...and someone else said PCM.
That's possible.
http://www.fordf150.net/forums/viewt...p?f=21&t=97221
Quote:
Originally Posted by bayouvol View Post
How can I check and is there anything else? I am not real mechanically inclined but I can follow directions.
Then turn the key OFF, and post what happens to the pump.
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Old 11-27-2012, 11:25 PM   #8
bayouvol
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Latest, key off the pump does not run. Key on it runs all time. Pulled the air filter and sprayed some ether in, the truck tried to start so PCM still good. Have changed the pressure regulator, relay and checked the fuse. What else can it be???
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Old 11-28-2012, 02:51 AM   #9
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Quote:
Originally Posted by bayouvol View Post
... Key on it runs all time. ...
Is the fuel pump running with the key on and the engine NOT running?
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Old 11-28-2012, 03:20 AM   #10
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Quote:
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key off the pump does not run. Key on it runs all time.
Turn the key to RUN, then pull the EEC PWR relay and post what the pump does.
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Originally Posted by bayouvol View Post
Pulled the air filter and sprayed some ether in, the truck tried to start so PCM still good.
NOT necessarily. Did you read that whole thread I linked? Did you inspect yours?
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Originally Posted by bayouvol View Post
Have ... checked the fuse.
WHICH fuse did you check? Check ALL of them in BOTH fuse boxes.
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Originally Posted by bayouvol View Post
What else can it be???
The EEC or its wiring, the FP relay or its wiring, the dash wiring, the frame wiring, the engine bay wiring...
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Old 11-28-2012, 10:46 AM   #11
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From post #12:
Quote:
Originally Posted by Steve83
A '92 already has Bosch relays.
Cool! :) ...and thanks for that. :)

--------------------------------------

Out of all the Ford relays in three Gen-8 trucks -none- of them were
good! One pickup had been garage kept and had only 66k on it too.

The problems I was having were intermittent opens and -makes-.

Like slam the door shut and the fuel pump would run. Sometimes
just run for a second and quit and sometimes I'd come out to the
Bronco from overnight and the fuel pump would be running!

Went to check the TPS (report) and with the key off from overnight
there'd be voltage on the system.

I swapped all those sorry suckers out to Bosch relays and sockets
from Parts Express. YMMV

This "Ford relays are crap" thing ain't nuthin' new. Had trouble with
'em in my '75 F150 I bought new and heard lots of stories from lots
of guys complaining about Ford relays all my life some of them "Ford
guys" some being mechanics, let alone other mechanics bad-mouthing
Ford relays. (they didn't have much else to bad-mouth Fords about ;)

Take it for what it cost ya. ;)

Alvin in AZ
ps- I'm not the only guy that's swapped his Ford relays and sockets
out for Bosch relays and sockets here on FSB. I just hadn't read it
here until after I had done mine is all. xD
pps- US&S DN-11 railroad signal relay I found a picture of on the
Internet, rebuilt by a buddy of mine Roman Gardia he was from
Stockton...
http://www.panix.com/~alvinj/file12/dn11.jpg
(un-re-scaled image to show RG's initials)
That relay is guaranteed not to ever let lightening weld the front (up)
and heel contacts together or ever "falsely make" the front contacts
when it ain't supposed to be.
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Old 11-28-2012, 12:33 PM   #12
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A '92 already has Bosch relays.
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Old 12-02-2012, 07:16 PM   #13
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got in today after the bronco sat for a week. Pump ran for 3 seconds then shut off. Truck started up. Drove it about half mile and it started running really rough. I pulled off the road and revved the motor, seemed to clear up but as soon as I tried to move it then it would not even pull the truck. It was bogging down. Finally revved up enough to get it back to the house. The check engine light flickered the whole way. I'll pull the codes but does anyone have any ideas? It went from not running and the pump running with the key on but engine off to running clear then getting rough after a few minutes.
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Old 12-02-2012, 08:10 PM   #14
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Quote:
Originally Posted by bayouvol View Post
got in today after the bronco sat for a week. Pump ran for 3 seconds then shut off. Truck started up. Drove it about half mile and it started running really rough. I pulled off the road and revved the motor, seemed to clear up but as soon as I tried to move it then it would not even pull the truck. It was bogging down. Finally revved up enough to get it back to the house. The check engine light flickered the whole way. I'll pull the codes but does anyone have any ideas? It went from not running and the pump running with the key on but engine off to running clear then getting rough after a few minutes.
Pull the codes and post them here. Without them it's anyone's guess whats wrong.
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Old 12-02-2012, 08:12 PM   #15
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Find a real mechanic, as U have no clue
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I would eat that like a retard on a bowl of oatmeal.......
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Old 12-02-2012, 08:31 PM   #16
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Thanks for nothing and go flame yourself!!!! I'll listen to someone who has something to say, not someone on the noobie board showing his retard attitude toward people who wants to learn. Let me guess, you work for Ford so you know everything but are too snobby to share any of that on the lowly.
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Old 12-02-2012, 08:50 PM   #17
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My fuel pump is running continuously. I have replaced the regulator and I am going to replace the relay next. Is there anything else I need to look for or change?

Are U twelve ???

U changed the regulator, so MAYBE in that huge state U live in there is a REAL mechanic U can ask.

U could have hundreds of issues that can cause your issues.


U want free web help, but don't help us !!


As a Mech for 35 yrs, I see this hundreds of times, U have the skill or U don't..................


been to the Library ???? Probably not.............



Not Flaming at all, this is life and LIFE is HARD !!
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Old 12-03-2012, 12:22 AM   #18
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As a mech for 35 years you do not know jack about helping! You need to stay in the other forums so you can show how smart you are. You are the first smart a-- I have met on here and you ruin a good website! Get out of my thread and go bother someone else who does not want to hear from you either. If you want guess my age then I can be pretty sure of your IQ. Pretty close to the same!
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Old 12-03-2012, 12:30 AM   #19
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As a mech for 35 years you do not know jack about helping! You need to stay in the other forums so you can show how smart you are. You are the first smart a-- I have met on here and you ruin a good website! Get out of my thread and go bother someone else who does not want to hear from you either. If you want guess my age then I can be pretty sure of your IQ. Pretty close to the same!

Your mom say's do your homework.............
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Old 12-03-2012, 02:51 AM   #20
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A battle of wits among the unarmed...
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