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Fuel pump relay?

Tiny
SHORTYDAWG
  • MEMBER
  • 1994 FORD RANGER
  • 2.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
New fuel pump not getting hot on pin 85 the red wire.I can jumper 87 to 30 at relay and pump worked fine but no start now my pump does not come on even when I jumper. Please help. I feel like it's a wiring issue but I'm not sure. This has been baffling me I'm on second fuel pump now it won't come on even when I jumper from 87 to 30 nothing. I'm getting power to fuel pump clip still no pump. I can't get power to red wire on 85 of fuel pump relay.
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Wednesday, January 15th, 2020 AT 10:17 AM

23 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,737 POSTS
Two different fuel injection systems were used, but the fuel supply system is the same for both. It sounds like you have multiple problems, and blown fuses are good suspects for two of them. The missing 12 volts on terminal 85 of the fuel pump relay comes from the PCM power relay. Check fuse 4, a 30-amp in the under-hood fuse box.

Even if fuse 4 is blown, you're quite a few steps ahead in the diagnostic steps. The fuel pump still should have run when you jumped terminals 30 and 87 together in the fuel pump relay's socket. Since it didn't, and you already replaced the pump, the list of suspects, in order of likelihood are a blown fuse 22, a tripped inertia switch, and a broken ground wire at the tank. If there's a problem with the ground wire, the fuel level gauge won't be reading correctly either. Here is the relay location and test guide

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Wednesday, January 15th, 2020 AT 2:14 PM
Tiny
SHORTYDAWG
  • MEMBER
  • 41 POSTS
  • 1994 FORD RANGER
  • 2.3L
  • 4 CYL
  • 100,000 MILES
Changed fuel pump no start. So I hampered 87 to 30 on fuel pump relay pump works. Couldn't get it to start gave up come out 1 week later even jumper can't get it to come back on.
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Did you check for power at pin 30?

Did you check for power to pin 86 with the key on.

I attached a wiring diagram for you to view. Check the fuse for the pin 30 with a test light to verify voltage.

Roy
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

Okay, in the diagrams down below I have included the engine management wiring diagrams for your vehicle with the fuel pump circuit highlighted for you as well as a diagram with call out for the Under hood Fuse/Relay Box, and a diagram of a pin relay for your reference. Okay, so first things first, can you please check fuse #22[20A] of the Under hood Fuse/Relay Box for us. Please get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
SHORTYDAWG
  • MEMBER
  • 41 POSTS
30 has power but 86 does not. 20 amp fuse looks fine.
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, sorry, it is 85 that gets power form the power relay right next to the fuel pump relay. You should have power there for 2 seconds with the key on. That is controlled by the ECM.

Roy
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
SHORTYDAWG
  • MEMBER
  • 41 POSTS
Okay, no power to 85 with key on.
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
SHORTYDAWG
  • MEMBER
  • 41 POSTS
And I'm testing fuel pump relay red wire is 85 no power with key on.
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
With the key on, it should have 12 volts for 2 seconds.

If it does not, then you need to check the power relay next to it.

I attached a diagram for the relay. Check the fuse I circled. Make sure there are 2 powers with the key on.

Roy
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
SHORTYDAWG
  • MEMBER
  • 41 POSTS
Okay, on the fuel pump relay 30 has constant power 85 does not with key on. On power relay 30 has constant power and 86 has power when key is on.I'm not getting power to 85 on fuel pump relay when key is on.
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, you may have a bad relay.

Does it click when you turn on the key?

Roy
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
SHORTYDAWG
  • MEMBER
  • 41 POSTS
Okay, no click when I turn on key, I have 3 other relays and swapped them out still the same thing, I tested for power on fuel pump relay, 30 has power 85 does not, so tested grounds, strange 85 which is red wire and it's grounded also 87 is grounded almost like it's the opposite of what it supposed to be.
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, looks like you need an ignition switch.

I attached the location for you. It is at the bottom of the steering column and is attached by 2 bolts.

Roy
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
SHORTYDAWG
  • MEMBER
  • 41 POSTS
Thanks Mr Roy. This truck has whooped me. I'll get an ignition switch and let you know.I was thinking maybe it had something to do with it wasn't sure. Needed to hear it from a professional. Have a wonderful New year and I'll update you.
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
LEONGILBERT
  • MEMBER
  • 1 POST
  • 1994 FORD RANGER
  • 4 CYL
  • 2WD
  • MANUAL
  • 96,000 MILES
Starting problem. Fuel pump does not come on. At times the vehicle will start just fine. Is there a relay or reset or could it be electrical? Where is the reset or relay.
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
IANHIESTAND
  • MEMBER
  • 14 POSTS
There is a relay in the under hood fuse block and a reset switch on the inside of the truck behind the kick panel on passenger side under glove box(small black plastic with red button on top)
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Tuesday, November 24th, 2020 AT 8:06 AM (Merged)
Tiny
PK47
  • MEMBER
  • 1 POST
  • 1994 FORD RANGER
  • 6 CYL
  • 4WD
  • MANUAL
  • 170,000 MILES
My fuel pump does not operate when the temperature is below 25 f. When the sun hits the truck bed the fuel pump operates. I have a good spark and good voltage leaving the interia switch.I replaced the pcm and fuel pump relay.I can't locate the connector to the fuel pump to check for a bad connection. Should I have the fuel pump and sender unit replaced? The truck runs fine otherwise.
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Tuesday, November 24th, 2020 AT 8:07 AM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Next time the pump wont operate go and hit the bed of the truck over the tank or hit the tank witha hammer. Turn noW?

IF it does I would be suspecting the pump is no good. The connector is on the top of the tank on the fuel pump as that is where the fuel pump is.
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Tuesday, November 24th, 2020 AT 8:07 AM (Merged)
Tiny
COWBOY SMITH
  • MEMBER
  • 1 POST
  • 1994 FORD RANGER
  • 6 CYL
  • 4WD
  • MANUAL
  • 190,000 MILES
I have a 94 ranger and we are not getting power to the fuel pump and we have change the ecc and fuel pump relay and the fuel pump and reset the kill switch and we have checked all the fuses and they are good. Could something in the distributor have something to do with it not getting power back there?
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Tuesday, November 24th, 2020 AT 8:07 AM (Merged)

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