SPONSORED LINKS

Fuel pump wiring diagrams (engine)

Tiny
HUSS05
  • MEMBER
  • 2000 GMC JIMMY
I need a wiring schematic of the fuel pump system with color code listings? Need the diagram for the fuel pump its self was replacing fuel pump and 3 prong connector broke. So now i'm not sure which wires go where? Plz help asap?
Monday, February 8th, 2010 AT 2:31 PM

11 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello,

Here is a guide to help you check the wiring and the engine/fuel pump wiring diagrams below.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+2
Monday, February 8th, 2010 AT 2:43 PM
Tiny
AGARNER1
  • MEMBER
  • 1 POST
  • 1999 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
I need instructions on how to change the fuel pump wiring harness on my 1998 Jimmy.
Was this
answer
helpful?
Yes
No
Monday, September 23rd, 2019 AT 2:52 PM (Merged)
Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
If you mean the connection on the end that connects to the pump it is a simple cut and paste operation. Basically you will cut off the old connector, go up the wiring an inch or two from the original connection. Now slip some heat shrink tubing onto the old wires. Twist and solder the new wires to each of the old ones following the same wiring colors. Once they are all soldered together smear some liquid electrical tape on them. Then slide the heat shrink over the connections. Shrink it into a tight fir. Now apply some more liquid tape on the outside. You want those connections sealed so they don't cause problems.
Was this
answer
helpful?
Yes
No
-1
Monday, September 23rd, 2019 AT 2:52 PM (Merged)
Tiny
ALPHADESTINY
  • MEMBER
  • 1 POST
  • 1996 GMC JIMMY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
I have replaced the fuel pump, wireing harness, and check the fuse and the relay under the hood. I even check the relay behinde the glove box. All system seems to be a go. Yet it's not running yet. Now the GMC dealer tells me about this ( gas-oil ) switch! But they will not tell me where it is. Can someone please tell me where to go look. One of the relays has power in, and 4-wires coming out: only 3-wires have fire. Could this relay be bad?
Was this
answer
helpful?
Yes
No
Monday, September 23rd, 2019 AT 2:52 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You got 2secs to check for power at the gray wire on the fuel pump connector-if its there and the fuel pump is till not pumping check the ground side and also look for a voltage drop on the gray wire-

On this ,Now the GMC dealer tells me about this ( gas-oil ) switch! they are talking about the fuel pump/oil pressure sending unit-see below how its wired.


https://www.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_31.gif

SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, September 23rd, 2019 AT 2:52 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The fuel pump/oil pressure sending unit is located on the no.6 below-its on top rear of engine near the distributor.


https://www.2carpros.com/forum/automotive_pictures/12900_opsu_1.jpg

Was this
answer
helpful?
Yes
No
-1
Monday, September 23rd, 2019 AT 2:52 PM (Merged)
Tiny
ARNO
  • MEMBER
  • 1 POST
  • 1995 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
About a year ago I had to replace my fuel pressure valve on the spider fuel injector harness. After that every once in a while the car would just stop. After waiting about 5-10 minutes it would start right up and run fine. Never could figure out what the problem was. Now when driving the engine speed surges and also hesistates when I give it gas. I thought I would first change the fuel filter but after that I am not sure whether it might be the fuel pump but that is only about two years old, or if I need a need the whole new spyder assembly or if I have to replace the injectors. Please help your advice would be greatly appreciated.
Was this
answer
helpful?
Yes
No
Monday, September 23rd, 2019 AT 2:52 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Sorry for the late reply. I'd use a gage and check fuel pressure first. With spider system, 60--66 psi, key on engine off. Sometimes the fuel poppets need cleaning.
Was this
answer
helpful?
Yes
No
Monday, September 23rd, 2019 AT 2:52 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Just to add, when the problem occurs, have a helper crank it, while you visually check for spark at the plugs. You can use a known good spark plug or spark tester, keep in the glove-box for future issues.
Was this
answer
helpful?
Yes
No
Monday, September 23rd, 2019 AT 2:52 PM (Merged)
Tiny
ALFREDONMONIKA
  • MEMBER
  • 1 POST
  • 1994 GMC JIMMY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 205,000 MILES
I was changing my distributor cap and roater and my truck will not start. I want check the wire order on the distributor cap. What is the correct order
Was this
answer
helpful?
Yes
No
Monday, September 23rd, 2019 AT 2:52 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
4.3L Engines
Firing order: 1-6-5-4-3-2
Distributor rotation: clockwise


https://www.2carpros.com/forum/automotive_pictures/261618_0900c1528024ff98_1.jpg



Thanks for using 2CarPros.com !
Was this
answer
helpful?
Yes
No
Monday, September 23rd, 2019 AT 2:52 PM (Merged)

Please login or register to post a reply.

Related Engine Wiring Content

VIEW MORE

Sponsored links