How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Ron Your Own Question

Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 26861
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
7276279
Type Your Ford Question Here...
Ron is online now
A new question is answered every 9 seconds

98 F150: good fuel pump relay..truck wont start..jumper

Customer Question

98 F150, verified good fuel pump relay, and jumpering cross relay runs new fuel pump. No power to energise relay, and truck won't start w/jumper. Help please
Submitted: 2 years ago.
Category: Ford
Expert:  Ron replied 2 years ago.
Hello and Welcome to Justanswer,

My name is XXXXX XXXXX I am here to try and assist your with your question.

Can you tell me what wires at the relay you are jumping to get the pump to run?
Customer: replied 2 years ago.
green /yellow and green/orange I believe Ron, ts raining here now. Straight across the relay, and it does turn the fuel pump on. The red has no volt.
Expert:  Ron replied 2 years ago.
The red wire to the fuel pump relay is powered up by the PCM (computrer) relay and there are 2 fuses you need to check first, they are the #16 in the under dash panel and the #24 in the under hood panel. Take a look at the enclosed diagram and you can follow the power flow.

graphic
Customer: replied 2 years ago.
I will recheck, but all fuses are good. I have chkd all several times. I will recheck.
Expert:  Ron replied 2 years ago.

The red wire to the fuel pump relay comes from the EEC relay and if you are sure the EEC relay has power to it and none coming out then its bad. Double check it for me .

Customer: replied 2 years ago.
Sorry Ron, which is the EEC relay, I nbeed to verify power to there?
Expert:  Ron replied 2 years ago.
The EEC relay is in the under hood panel just like the fuel panel

graphic
Customer: replied 2 years ago.
Only Yellow/black has power, others same as fuel relay. I actually used this relay and horn relay to swap out for fuel relay.
Expert:  Ron replied 2 years ago.
Ok the white light / blue need to be hot as well. That wire is supplied by the #16 fuse in the junction bot, are you sure its not blown.
Customer: replied 2 years ago.
#16 is a 40A maxi, and my light shows good.
Expert:  Ron replied 2 years ago.
No, the fuse come from the Interior fuse panel #16

Also check the #9 in the under hood panel.

Customer: replied 2 years ago.
sorry, let me check., 20a mini, not blown, no power at all???
Expert:  Ron replied 2 years ago.
Ok, also take a look at the #22 fuse in the under hood panel.
Customer: replied 2 years ago.
Both of those fuses havepower and are good Ron.
Expert:  Ron replied 2 years ago.
You need power on the white/lite blue wire at the EEC realy, try overlaying a new power wire and see if it starts,, if so then your open in your circuit from the fuse to relay.
Customer: replied 2 years ago.
Ron, can I jumper from hot on that relay to white Lt blue? or do I need relay in place w/adde hot wire to Lt blue term?
Expert:  Ron replied 2 years ago.
It is a key source but to test it use the battery.
Customer: replied 2 years ago.
White/ lt blue is top socket, jumpered to 12v, relay out, did not start, fuel pump did not tutn on?
Expert:  Ron replied 2 years ago.
The relay has to be in place, you need to come in from the back side .
Customer: replied 2 years ago.
K, Take me a few.......
Expert:  Ron replied 2 years ago.
Let me know
Customer: replied 2 years ago.
done, same as before, didn't start and fuel pump did not energize. relays not making any noise. came off battery.
Expert:  Ron replied 2 years ago.
Ok, you told me every wire was hot except the red wire on the Fuel pump relay , was that correct?
Customer: replied 2 years ago.
the only wires that are hot are the full time hot wires on both relays. no other power on either, and inside fuse 22 does not have power, but it is good.
Expert:  Ron replied 2 years ago.
Which relay are we talking about?
Expert:  Ron replied 2 years ago.
Are you checking the relay with the Key on
Customer: replied 2 years ago.
ok, with jmpr in place, on eem, all but blk(gnd?) hot, on fuel pump relay, all but green/yellow hot. so appears relays working w/jmpr, but no start?
Expert:  Ron replied 2 years ago.
There is no black wire on the Fuel pump realy. See the enclosed diagram. All the wires should be hot on it cranking beside the Orange/light blue wire. are they


graphic
Customer: replied 2 years ago.
green/yellow not hot on fuel relay, blck on eec not hot. We did hear the Fuel pump cycle this time.
Expert:  Ron replied 2 years ago.
The black wire on the EEC relay is a ground and not suppose to be hot. If the pump is cycling it shoud start and run.
Customer: replied 2 years ago.
The fuel pump only cycles when I put my light on blue orange, but will not start???? Tried several times.
Expert:  Ron replied 2 years ago.
The blue/orange is the PCM ground and if it runs with the light on it that means the PCM isnt grounding it. Try running a ground to it and see if the pump runs while cranking.
Customer: replied 2 years ago.
ran jmpr, fuel pump running, but won't start.??????
Expert:  Ron replied 2 years ago.
Then in most case that means the PCM has failed.
Customer: replied 2 years ago.
Ron, will a code scanner verify that??? I will try and borrow one if it will help me?? And thank you for all your trbl!!! Don't mind spending the money for the PCM, as long as thats it!
Expert:  Ron replied 2 years ago.
A scan tool will not help . If you have doubts you may want to seek a second opinion.
Customer: replied 2 years ago.
You're the expert, I'm not doubting, just hoping. that will fix. Will my #22 fuse be hot w/new PCM?
Expert:  Ron replied 2 years ago.

The #22 fuse needs to be hot in the under hood panel.

Customer: replied 2 years ago.
I'm sorry, I meant the #16 fuse in the interior fuse panel. I'm 58, so if i don't write it down I get mixed up. I had a similar prob on my amigo, caused by alt. able to jmpr around it. But not here. If all that's left is to replace ecm, guess I'll give it a vtry! Thanks for your guidance Sir!!!
Expert:  Ron replied 2 years ago.
No the #16 fuse isnt a problem. The #22 needs to be hot.
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 26861
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
Ron and 9 other Ford Specialists are ready to help you
Customer: replied 2 years ago.
yes sir # XXXXX is hot, just rechecked. Thanks for trying!!! Give me somewhere to star tomrrow!! Have a great evening.
Expert:  Ron replied 2 years ago.
Im here tomarrow if you need me. Let me know.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
< Last | Next >
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
  • Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me. Molly USA
  • I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service. Jason V. Kirkland, WA
  • I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there. BR New Jersey
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
 
 
 

Meet The Experts:

 
 
 
  • Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
< Last | Next >
  • http://ww2.justanswer.com/uploads/FO/fordguy4u/2011-12-17_222940_HPIM1257.64x64.JPG Ron's Avatar

    Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka- Moose)'s Avatar

    Chris (aka- Moose)

    Ford Technician

    Satisfied Customers:

    22382
    16 years experience with Ford.
  • http://ww2.justanswer.com/uploads/JM/jmcdo28/2012-2-23_01655_resized.64x64.jpg John Mc's Avatar

    John Mc

    Ford Technician

    Satisfied Customers:

    5493
    19 years Ford Lincoln Mercury experience
  • http://ww2.justanswer.com/uploads/wmarti7/2009-4-18_04332_Avatar.jpg Chuck's Avatar

    Chuck

    ASE Certified Technician

    Satisfied Customers:

    1684
    33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    1518
    12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.
  • http://ww2.justanswer.com/uploads/BA/baddad1/2014-4-1_23659_avatar.64x64.jpg Mike V.'s Avatar

    Mike V.

    Auto Service Technician

    Satisfied Customers:

    789
    25 years experience on all makes and models, Licensed NYS Inspector.
  • http://ww2.justanswer.com/uploads/lostrider/2009-9-26_23144_php4VNWAA_c1PM1.jpg lostrider's Avatar

    lostrider

    Ford Technician

    Satisfied Customers:

    2940
    ASE Master Technician, Ford Senior Master Technician,Diesel certified, ASE Master, 22 yrs FORD exp.