Fuel pump relay?

Tiny
SHORTYDAWG
  • MEMBER
  • 1993 FORD RANGER
  • 3.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
Using test light at fuel pump relay. I have power from fuse but when I turn on ignition I am suppose to have a 2 second light. I have nothing. What's the diagnosis? Please help!
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Thursday, November 21st, 2019 AT 12:06 PM

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Tiny
ASEMASTER6371
  • EXPERT
Good afternoon,

At the relay, you should have 2 wires with battery voltage with the key on. The black/yellow wire and the red wire.

The ECM grounds the control side for 2 seconds with the key on for the prime cycle.

The light blue/orange wire is what goes to the ECM for grounding.

Roy
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
SHORTYDAWG
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Thanks. My problem is a bought a fuel pump trying to diagnose the problem. I bought it online cheap not the whole sending unit just the pump. I got it running for 10 minutes shut it off put tank back in straps. Doesn't run again. So I dropped tank again checked everything nothing I could see wrong. Started with relay have power constant from black and yellow with test light, but when I check the blue and orange I should get a 2 second light when I turn ignition on, but I don't. Any ideas? Thanks so much you are appreciated!
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
ASEMASTER6371
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Is the red wire at the fuel pump have voltage?

The blue/orange is a ground wire, not a power wire.

Does the relay click when you turn the key on for 2 seconds?

Roy
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
SHORTYDAWG
  • MEMBER
Okay, my relay may be wired wrong I have 85 red 86 blue orange 87 double green 30 black and yellow it goes to fuse hot always. Once again thanks so much. Been trying to figure this out for a month and don't want to buy another pump for nothing.
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
ASEMASTER6371
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Okay, 86 goes to the ECM. That is the ground.

85 is red and should have power with the key on.

Does the relay click when you turn on the key?

Roy
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
SHORTYDAWG
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Okay, thanks. It has gotten dark. I will check tomorrow. Thanks so much for the information. I will be on tomorrow. Have a wonderful day Mr. Roy. I'll check with you tomorrow.
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
ASEMASTER6371
  • EXPERT
You are welcome.

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

always glad to help.

Keep us updated.

Roy
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
SHORTYDAWG
  • MEMBER
Okay, I'm back on. Before I do anymore troubleshooting I need to make sure my relay is wired right so I have 85 red wire 86 lt blue and orange 87 two wires into one green and yellow and 30 black and yellow hot from fuse. Is this right and what does each wire go to. Thanks again when I find out my relay is wired right I will go from there. Once again you help is greatly appreciated.
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
ASEMASTER6371
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Yes, that is correct.

The blue/orange goes to the ECM for grounding.

The green/yellow goes off to the interia switch.

The power wires come from the fuse block for power.

Roy
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
SHORTYDAWG
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Okay, wires are in order when I test for power with test light I have power from black and yellow constant. I checked blue and orange wire. However, by cycling my ignition left on I have nothing.
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
ASEMASTER6371
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Okay, what about the red wire? It requires power with the key on?

Roy
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
SHORTYDAWG
  • MEMBER
I have nothing with key on cycle it a few times. I have no light on test light.
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
ASEMASTER6371
  • EXPERT
Okay.
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
SHORTYDAWG
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Okay, I got power to red wire for two seconds. My battery is low. I hooked charger to it that's when I got power to red wire 2 seconds. Could this be as simple as a bad battery? But I still getting nothing at pump. As I said before I changed pump not whole unit bought it online and yes I bought cheapest they had. Truck cranked up and idled fine. I went to strap tank back up of course a lot of moving tank and clip to pump around and haven't had no fuel since.
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
ASEMASTER6371
  • EXPERT
Check the wire while cranking.

Roy
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
SHORTYDAWG
  • MEMBER
And now I can't get power again to red wire for 2 seconds again.
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
ASEMASTER6371
  • EXPERT
Check it back at the power relay right next to the fuel pump relay. Check the diagram.

Roy
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
SHORTYDAWG
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Okay, I have three relays EEC power relay A/C wot relay and fuel pump relay.
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
ASEMASTER6371
  • EXPERT
Power relay.
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Tuesday, November 24th, 2020 AT 8:14 AM
Tiny
SHORTYDAWG
  • MEMBER
Okay, Mr Roy. I have power at EEC relay, I have constant power to fuel pump relay. However, I have no power to red wire for 2 seconds. I got it for a minute and now nothing. Thanks for being patient with me. I feel this is a simple wire problem but I can turn a wrench better than trace electrical. Lol But I will follow directions.
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Tuesday, November 24th, 2020 AT 8:14 AM

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