fuel pump questions. - Ranger-Forums - The Ultimate Ford Ranger Resource


General Ford Ranger Discussion General discussion of the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 02-25-2015
Member
Thread Starter
 
Join Date: Feb 2015
Location: Munster, Indiana
Posts: 9
fuel pump questions.

Pulled my fuel pump, tested it with 12v, thing turns on. Tested my relay that's fine as well. Im gonna test continuity in the lines once i get some day light tomorrow but if those are fine and im getting continuity in all the wires what else would stop my fuel pump from kicking on? i don't have a pressure gauge to test the fuel line but i dont think that could help since the pump itself isnt turning on. I'm at a loss and i could use your wisdom guys.
Reply With Quote
  #2  
Old 02-25-2015
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,595
Fuel pump power

Battery--------30amp fuse--------fuel pump relay------inertia switch------fuel pump---GROUND

30 amp fuse is in the engine compartment fuse box, FP fuse
inertia switch is in passenger foot area, under glove box, they move it around, but usually just above the top of the carpet, also could be at the top of the kick panel.
Small box with a wire on each side, Red reset button on the top.

Fuel pump needs a good Ground as well as 12volts.
Reply With Quote
  #3  
Old 02-25-2015
Member
Thread Starter
 
Join Date: Feb 2015
Location: Munster, Indiana
Posts: 9
I'll check all of them tomorrow, thanks for the reply.
Reply With Quote
  #4  
Old 03-05-2015
Member
Thread Starter
 
Join Date: Feb 2015
Location: Munster, Indiana
Posts: 9
Checked all the above and i'm convinced a wire is broken somewhere in the fuse box where the relay is plugged in or somewhere in the harness. I think i'm just going to run a toggle switch from the (red/black) wire of the fuel pump up to the battery and then ground the pump to the battery as well. Anyone ever done that before or is this a no no ?
Reply With Quote
  #5  
Old 03-05-2015
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,595
No one "plans" on being in an accident, that's the "no-no" of hot wiring fuel pump power, pump stays on feeding a fire if there is one.

But doing it won't hurt the fuel pump.
The 12volt wire to the pump needs a 30amp fuse inline, and that would run directly to the fuel pump, or to the inertia switch, for some protection.

You would use the "toggle" switch for the fuel pump Ground, NOT the 12v, Ground is easier and less chance of a short, and you don't need it to the battery, any cab ground will work.


If you want to trouble shoot it more.
Pull out the Fuel Pump relay
Key off
There should be 5 slots in relay plug, one should have 12volts, thats from the Fuel Pump Fuse.
Key on
A second slot should now have 12volts, thats from the EEC relay(next to fuel pump relay).
Reply With Quote
  #6  
Old 03-05-2015
Member
Thread Starter
 
Join Date: Feb 2015
Location: Munster, Indiana
Posts: 9
Well if i'm still awake after the accident ill try to turn it off haha. I really don't want to have to drop that damn tank again, and google isn't giving me the exact answer i want. Which one of the blacks is the ground to the fuel pump? im tempted to just cut them both and run them both to ground but if i can get the right one without having to possibly break my fuel gauge that would be great.
Reply With Quote
  #7  
Old 03-05-2015
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,595
Have a look here: http://www.justanswer.com/ford/3huzq...zda-b2300.html

Ground for Fuel Gauge sender in the tank shows Black with yellow or white stripe
Reply With Quote
  #8  
Old 03-09-2015
Member
Thread Starter
 
Join Date: Feb 2015
Location: Munster, Indiana
Posts: 9
Quote:
Originally Posted by RonD View Post
Have a look here: http://www.justanswer.com/ford/3huzq...zda-b2300.html

Ground for Fuel Gauge sender in the tank shows Black with yellow or white stripe
So I've put the toggle switch in, pump is running, cranking the engine over. But its not starting up. When I spray starter fluid in it fires up, but outside that it won't stay running even tho the pump is running. I've completely bypassed the relay and am wondering what could be my issue now?
Reply With Quote
  #9  
Old 03-09-2015
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,595
Well, spark is working, or manually adding fuel wouldn't get engine to fire

So must be fuel injectors.
Each fuel injector should have 12volts when key is on.
Computer Grounds an injector to open it.
So there are 6 Ground wires from computer, but if even a few were broken engine would fire because the others would be opening.

I would bite the bullet and rent a fuel pressure gauge and a Noid Light
You really need a Noid Light to see if computer is Grounding an injector.
And pump running doesn't mean 35psi fuel pressure

Last edited by RonD; 03-09-2015 at 09:51 PM.
Reply With Quote
  #10  
Old 03-10-2015
Member
Thread Starter
 
Join Date: Feb 2015
Location: Munster, Indiana
Posts: 9
Alright i'll go that route next. If i run into more problems i'll be back in a few days haha.
Reply With Quote
  #11  
Old 03-15-2015
Member
 
Join Date: Mar 2015
Location: Avondale AZ
Posts: 6
if I am not mistaken, doesn't the fuel pump get a message from the electronic engine control?on my 94, the EEC relay and the fuel pump relay are exactly the same.when I replaced both of those relays, everything was fine.they only cost about 5 or 6 dollars each. and on another note, why are you dropping the fuel tank? Isn't it easier to remove the bed?
Reply With Quote
  #12  
Old 03-15-2015
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,595
Quote:
Originally Posted by grmpyoman View Post
if I am not mistaken, doesn't the fuel pump get a message from the electronic engine control?on my 94, the EEC relay and the fuel pump relay are exactly the same.when I replaced both of those relays, everything was fine.they only cost about 5 or 6 dollars each. and on another note, why are you dropping the fuel tank? Isn't it easier to remove the bed?
Yes, that is correct.
EEC relay closes when key is turned on
EEC relay gives power to the EEC(computer) of course, and also fuel injectors, fuel pump relay, and spark system on some models.

EEC(computer) does control fuel pump relay via it's Ground wire
EEC relay gives fuel pump relay power but since it isn't Grounded it doesn't close so fuel pump isn't on.
Computer does ground fuel pump relay for two second to prime system when computer first starts, it won't ground it again until engine RPMs are above 500, then computer grounds it until key is off or RPMs drop below 500.

In this case however poster does have a running fuel pump so relays should be fine, what is missing is fuel being fed into the intake, so fuel injector issue, assuming fuel is making it from running pump to the injectors, which is what a pressure test would show.
Reply With Quote
  #13  
Old 03-16-2015
Member
Thread Starter
 
Join Date: Feb 2015
Location: Munster, Indiana
Posts: 9
I've frankenstein'd my truck pretty hard. I 5 speed swapped after my automatic trans died and from then on it's been a headache (no speedo, my key ignition has gone out on me so i jump the solenoid for the starter with a push button, and now this fuel problem) but i love this damn ranger to much to get rid of it.

I've got a friend thats going to let me borrow his fuel pressure kit but he hasnt gotten around to bringing it over. I'm currently throwing parts at it right now to try to fix it in the mean time. I put a new fuel filter in and i'm about to put a new fuel pump regulator on it but my haynes manual doesn't even list that i have one. Is the 96 a returnless fuel system or is there one located in there somewhere?
Reply With Quote
  #14  
Old 03-20-2015
Member
Thread Starter
 
Join Date: Feb 2015
Location: Munster, Indiana
Posts: 9
Quote:
Originally Posted by RonD View Post
Well, spark is working, or manually adding fuel wouldn't get engine to fire

So must be fuel injectors.
Each fuel injector should have 12volts when key is on.
Computer Grounds an injector to open it.
So there are 6 Ground wires from computer, but if even a few were broken engine would fire because the others would be opening.

I would bite the bullet and rent a fuel pressure gauge and a Noid Light
You really need a Noid Light to see if computer is Grounding an injector.
And pump running doesn't mean 35psi fuel pressure
I've got no fuel pressure, cranking the engine for a minute straight and nothing. So I believe that means I've got something blocking up my lines?
Reply With Quote
  #15  
Old 03-20-2015
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,595
Quote:
Originally Posted by perkinja View Post
I've got no fuel pressure, cranking the engine for a minute straight and nothing. So I believe that means I've got something blocking up my lines?
FYI, Cranking engine doesn't make fuel pump come on.
Turning the key on and off does.

Remove the fuel filter in the frame rail, put a bucket under the lines, then turn key on, fuel pump will come on for 2 seconds and there should be fuel in the bucket, if not then issue will be from there back to tank or the "sock" filter in the tank with fuel pump.

If you get fuel out from the pump, then blow thru filter, make sure gas comes out easily.
Then pull off the fuel line at the intake/rail, blow it out
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
my fuel pump wont turn on ive replaced the relay n the pump.. 00Red 2.9L & 3.0L V6 Tech 1 05-28-2013 10:00 PM
$125 Fuel Pump vs $300 Fuel Pump? Which to get? TheRealestWhiteBoy General Technical & Electrical 12 01-19-2013 08:05 PM
Want to Buy: Fuel line between fuel filter & fuel pump - TN iplayloudly Interior, Exterior, Electrical, & Misc. 7 05-02-2012 04:10 PM
fuel pressure regulator or fuel pump fedupdon General Technical & Electrical 1 01-31-2011 07:04 AM
1999 Ranger, 3.0 L - Will regular fuel pump work (have flex fuel) jakD General Technical & Electrical 3 10-15-2010 12:23 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 05:16 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.