No power to fuel pump - Relay?

Tiny
BRAMLETT1981
  • MEMBER
  • 4 POSTS
Oh and all of that was in fact tested, that is pretty much why I was so stumped! I have never seen a prong wear down, hopefully it is the actual prong of the relay and not the box connection.
Was this
answer
helpful?
Yes
No
-1
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Glad you got it running and good luck
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
BRAMLETT1981
  • MEMBER
  • 4 POSTS
Thanks!
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
EBRAGAN420
  • MEMBER
  • 1 POST
  • 1998 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 280,000 MILES
Have a 1998 dodge ram 1500- 2wd 360v8
a while back electric fuel pump stopped working (100% sure it was pump), replaced it and truck ran fine for three months. Drove truck all day for work, and had not one issue. Parked in driveway after work, next mourning fuel pump wouldn't kick on. Replaced fuel pump, still wouldn't come on. Replaced relay to fuel system and asd still no pump. Ran hot wire kicked right on, checked fuel all the way to fuel bar but won't start up. Turns and turns but no start up, and turns like the tank is dry. Should mention truck has been wrecked and beat to hell(work truck). I'm thinkin ecm at this point or maybe something to do with asd system. What is your idea's and please let me know how to check. Thanks for any help you can provide
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, the injectors won't pulse without rpm signal. I would have thought there would have been an initial prime from the pump key on, engine off. Did you check the wiring circuits, voltage feed, to both asd and fuel pump relays. I believe the voltage for the load side and coil side of both relays should be hot all the time. Use a testlite.
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
DIRTBIKE1
  • MEMBER
  • 3 POSTS
  • 1998 DODGE RAM
  • V8
  • FWD
  • AUTOMATIC
  • 200,000 MILES
Replaced fuel pump 6 months ago, truck ran fine for 3 months after. Parked one night in driveway, had ran fine all that day. Next mourning pump would not engauge with ignition and has not ran since. Put another pump in recently and no change. I have checked all fuses and relays, seem to all be good. Can hear a relay tick when key is on but not sure which, also once key is on for 15 seconds I get a ding and fuel light comes on dash at same time odometer will begin to flash. Followed wires throughout and see no bare or bad spots in loom. Test lighted wires had power to relay, power to relay junction(engine inline)on bottom or pronged side(when touching prong that leads to fuel pump relay it will tick. Any idea's, maybe a roll over reset button(can't find) or safety shut off. Does flashing odometer when fuel light comes on mean anything?
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
OK first off you need to check fuse number 9 in the fuse box inside the truck. Now if this is good then in the under hood fuse box there is a fuel pump relay and an auto shut down relay. I will need you to be able to check both. Now you will need to have a digital multi meter for this part. Let me know if you have one and I will walk you through the test to see what is or isn't going on. Thanks and get back to me.
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
WINCHESTER RAM
  • MEMBER
  • 2 POSTS
  • 1998 DODGE RAM
  • V8
  • 4WD
  • MANUAL
  • 260,000 MILES
98 Ram 1500. Battery went completly dead. Went to jump start with a plug in type charger. Used the start mode less than 3 minutes. Now fuel pump wont power up. Checked all fuses. Checked ground wires on batt terminals(replaced). Checked ASD and fuel pump relays. Relays checked good but no power to terminal 86 with ignition on. Where do I go next. The schamatics are hard to read. It looks like the power is comming from the ignition switch?
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I'm not sure of engine litre size? Fuse 9--10 amp fuse, use testlite, check fuse circuit for voltage, goes hot when you turn on the key. Also, check fuse 3-- 20 amp fuse in power distribution center under the hood, use testlite on fuse circuit, should be hot all the time. Let us know what you find.
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
WINCHESTER RAM
  • MEMBER
  • 2 POSTS
Like I said there is no power comming from the PCM to the #86 terminals on the ASD or the Fuel relays. Is this a ignition switch or PCM problem.
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you have a chance to test the circuits I asked about?
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
SCARECROW_NE
  • MEMBER
  • 2 POSTS
  • 1998 DODGE RAM
  • V8
  • 4WD
  • AUTOMATIC
  • 145,000 MILES
I fear I already know the answer, but just trying to make sure I've covered all the bases before the knuckle busting begins. Truck was running fine. Came home, next morning wouldn't start. Cranks like crazy, no fire.
Noticed I don't hear the fuel pump prime now. Checked all fuses (under dash, under hood) and played "musical relays" swapping like relays for fuel system and ASD.
Gave it a shot of carb cleaner, fires off and tries, so seems there's spark. Had a buddy crank it while I beat the b'Jesus out of the bottom of the tank. No joy.
Is there anything else I could check, or is it time to lay in a supply of beer, bandaids, and a fuel pump?
Thanks for any suggestions!
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Access the fuel pump connector and make sure power is getting there. IF it is, try to get yourself an OEM one from the dealer. Aftermarket ones usually fail early in my experience.
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
SCARECROW_NE
  • MEMBER
  • 2 POSTS
Thanks, Service Writer! I cozied up under it this afternoon with a test probe and I AM getting the couple seconds of power to the connector when the ignition is turned on. Thanks also for the tip on an aftermarket pump! I'll head over to the dealer tomorrow and get the show on the road. I owe you a [insert favorite beverage here]! Thanks again!
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Thanks beats any beverage! Thank-you for the donation.
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:11 PM (Merged)
Tiny
DIRTBIKE1
  • MEMBER
  • 3 POSTS
  • 1998 DODGE RAM
Electrical problem
1998 Dodge Ram V8 Two Wheel Drive Automatic

I have a 98 ram 1500, 1 year ago I replaced the fuel pump cause it quit working. Yesterday I replaced it again, now the pump wont turn on when I turn the key to the on position, I checked my fuses and replaced the relay under the hood, what else could I check to find my problem?
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:12 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Have you tried to jumper relay? Does relay click when key turned? Can you get to pump connector and see if voltage and ground are present? Try swaping relay with the ASD next to pump relay.
Let me know
Thanks for donate
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:12 PM (Merged)
Tiny
SMCMULLEN
  • MEMBER
  • 1 POST
  • 1998 DODGE RAM
1998 Dodge Ram V8 Four Wheel Drive Manual

Where is the emergency fuel relay switch on this truck? I ran out of gas and cannot get it started.
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:12 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
DO NOT HAVE one
u may need a new feul pump
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:12 PM (Merged)
Tiny
WILL67
  • MEMBER
  • 0 POST
  • 1998 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 235,000 MILES
Hi I was just woundering if there would be some hints that you would be able to throw at me because i, m out of conclusions.I have tried everything I tested all circuits in the power distribution center and all relays and fuses and checked the fuses in the dash box as well as replacing both battery terminals and cleaning the grounds and I still don, t here the fuel pump motor. And I was woundring if there would be any other spots I can check befor I have to remove the tank to check the fuel pump relay and sending unit. Thanks a bunch.
Was this
answer
helpful?
Yes
No
Tuesday, August 25th, 2020 AT 5:12 PM (Merged)

Please login or register to post a reply.

Sponsored links