Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

Gas pump relay problem??

Old Jun 7, 2004 | 08:56 PM
  #1  
JayHodge's Avatar
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From: NY
Car: 1987 Iroc-z
Engine: 5.7L 350
Transmission: 700 r4
Gas pump relay problem??

My gas pump stopped workin when i was driving the other day.... i tested the pump and still works, and found out the wire that turns on the pump is not sending power back their when the key is turn on..... i went to the fuel relay switch and powered the tan wire which turns ont he pump, and works fine, runs the pump... but stil when i turn the car on no power goes back there.... i bought a new relay and nothin what can i do??
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Old Jun 7, 2004 | 09:14 PM
  #2  
sqzbox's Avatar
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From: Ft. Branch, In.
Car: 88 formula WS6
Engine: 305 Lo3
Transmission: 700-R4
First, you need to check the fuel pump fuse in your fuse block, Sounds like you've lost the connection from your ign. to relay.
You have already checked the pump and it works, so I can only assume you haven't checked the fuse yet. You need to do that first whenever you have an elect. problem. Saves alot of money too!
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Old Jun 7, 2004 | 09:40 PM
  #3  
JayHodge's Avatar
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From: NY
Car: 1987 Iroc-z
Engine: 5.7L 350
Transmission: 700 r4
all the fuses seem, to be ok in the block, do you no which one exatcly is the fuel pump fuse?

also, what is the relay by the battery, its mounted just to the side of the battery, near the radiator......this seems to have a melted, connector on it... if that is n e thing?
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Old Jun 7, 2004 | 10:19 PM
  #4  
S10Wildside's Avatar
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From: Pennsylvania
The fuel pump relay is not connected to ignition power. The relay switch has power on it at the orange wire. That orange wire goes to the battery and to the 20 amp fuse near the battery.

With the key ON, the relay only closes the switch for a few seconds. So, if you have the key ON and the engine not running, then you will not notice power on the wire going to the fuel pump. If the motor is running, you should always have power on that wire.

There have been so many posts recently related to fuel pump issues that all the info you need is available in some of the recent posts.
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Old Jun 7, 2004 | 11:01 PM
  #5  
JayHodge's Avatar
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From: NY
Car: 1987 Iroc-z
Engine: 5.7L 350
Transmission: 700 r4
iim pretty sure i dont have power at all to that orange wire, and i cannot find the 20 amp fuse that u r talkin about... ill look more in the am, thx alot mike
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Old Jun 8, 2004 | 12:06 AM
  #6  
Stekman's Avatar
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From: Grand Rapids, MI
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
There is a small inline fuse/holder up by the battery/coolant overflow resevoir. Should be attached to the fender...
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Old Jun 8, 2004 | 01:26 PM
  #7  
JayHodge's Avatar
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From: NY
Car: 1987 Iroc-z
Engine: 5.7L 350
Transmission: 700 r4
it was hiding in the pass fender all fixed now and gas gage works for the first time in 2 years (changed sending unit)
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Old Jun 8, 2004 | 05:34 PM
  #8  
sqzbox's Avatar
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From: Ft. Branch, In.
Car: 88 formula WS6
Engine: 305 Lo3
Transmission: 700-R4
Yeah, I figured it was the fuse but I thought it was in the fuse block. Fotunatly, I've never had one go out on me but I've heard it happen to others. Glad you got it fixed! You say you replaced the sending unit and now your gas gauge works? Isn't it in the tank? I'm confused! Surely you didn't drop the tank and not change the fuel pump!
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Old Jun 8, 2004 | 07:27 PM
  #9  
JayHodge's Avatar
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From: NY
Car: 1987 Iroc-z
Engine: 5.7L 350
Transmission: 700 r4
i got a sending unit from s10wildside, the other day, i have an "access door" in my trunk best thing ive ever done, so i can pull that out in 3 minutes, the float on my other one was fried i guess, and changed it and works gr8


what in the heck would make that fuse in the front by the bat even blow like that? i was just driving normally... kinda odd.
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Old Jun 8, 2004 | 07:41 PM
  #10  
deadbird's Avatar
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From: So.west IN
Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
Originally posted by JayHodge
what in the heck would make that fuse in the front by the bat even blow like that? i was just driving normally... kinda odd.
Could have been a fluke power surge. That fuse also powers/protects the ECM, maf and burnoff.
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Old Jun 8, 2004 | 10:41 PM
  #11  
sqzbox's Avatar
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From: Ft. Branch, In.
Car: 88 formula WS6
Engine: 305 Lo3
Transmission: 700-R4
That's what I wanted to hear! I put one (an access door) in mine last year and it only took a couple of hours! Better keep an extra fuse in the console though, just in case, so you won't get stranded!! Maybe the fuse was just old and ready to go because it's been in there since the car was new! One thing though, I know where the fuse is now because of your problem. I have two things left to fix on mine, the cruise and the left headlight. I've already fixed the headlight door on the pass. side and tonight the drivers side gave me a bunch of crap going up! The last one cost me $75.00 to fix when I finally found one at a bone yard 15 mi. from here. Their getting hard to find used, and the last one was out of an 84. Had to splice a 3 wire into 2 to get it to work.
It took me most of the night to figure that one out on my own!
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Old Jun 9, 2004 | 09:47 PM
  #12  
JayHodge's Avatar
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From: NY
Car: 1987 Iroc-z
Engine: 5.7L 350
Transmission: 700 r4
good luck with the cruise i have tried forever to get it to work, and finally am saying screw it! and prolly going to rip it out lol
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