Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN




SAFARI Fuel Pump Relay-"where?" HELP


  Email This Post



Marvin
New User

Dec 13, 2005, 2:14 PM

Post #1 of 2 (3394 views)
Shortcut
SAFARI Fuel Pump Relay-"where?" HELP Sign In

Unsure I have a 1994 GMC Safari Van Frown Where in the World is the Fuel Pump Relay.I've almost taken the whole thing apart.The Fuel tank is out,etc-etc,The pump works with 12 Volts on the outside --PLEASE Help


DanD
Veteran / Moderator
DanD profile image

Dec 14, 2005, 7:31 AM

Post #2 of 2 (3375 views)
Shortcut
Re: SAFARI Fuel Pump Relay-"where?" HELP [In reply to] Sign In

Here’s a partial-wiring diagram showing the fuel pump circuit, according to the diagram, the relay is under the hood near the heater blower motor.
Terminal A of the relay, dark green/white wire, should have battery voltage on it during initial ignition on for 2 to 3 seconds (Prime Cycle) and then again during cranking. (ECM control circuit.)
Terminal C, black wire is relay ground.
Terminal B, Gray wire (there should be two) One is battery voltage feed from the engines oil pressure switch, the other gray is battery voltage feed to the fuel pump. They use the oil pressure switch as a back-up means of turning on the fuel pump if the relay fails. In other words if the fuel pump relay fails (Everything else ok) and you were to crank the engine long enough to build oil pressure, the contacts in the pressure switch would close allowing battery voltage to be supplied to the fuel pump.
Terminal C4, red wire is the fuel pump test terminal. If all is well in the system and you applied battery positive voltage to this wire the fuel pump should run.
Terminal D. orange wire should have battery voltage on it at all times, this same orange wire also feeds the oil pressure switch, and the ECM. This circuit is protected by a 15 amp fuse, found in the under dash fuse panel labeled ECM/BATT
Let us know what you find and I hope I didn’t loose you in my explanation of the wiring circuit.
Dan.



Canadian "EH"








Advertising


  Email This Post
 
 






Latest Forum Post

I'm part of a research project at my university where we have two flow meters mo...


Hi, About 1.5 years ago I purchased a 2003 Honda Civic EX with 130,000 miles on...


Hi car experts, I'm hoping you can help me fix my car. Below is a description o...


98 Pontiac sunfire,2.2,new cylinder lock won't install,something in side the cyl...


Greetings, I have a 91 honda civic that I was taking up a small hill on the in...


Driving home from a gig a bandmember was charging his phone from the USB output ...


Feed Button






Automotive Forum Categories
AC Auto Repair
Auto Body Repair
Auto Insurance
Automotive Repair
Automotive Wiring
Automotive World
Brake Systems
Car Care Tips
Car Racing
Car Shows and Events
Car Stereo Repair
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair
Gasoline and Motor Oils
General Discussions
Motor Vehicle Inspection
Motorcycle ATV Repairs
Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Repair
Motorcycle Seat Repair
Remote Control Cars
Steering and Suspension
The Bargin Bin
Traffic Ticket Help
Tricks of the Trade
Truck Repair
Truck Repair Advice
Truck Engine Repair
Truck Suspension Repair
Car Forum - Sitemap


Search for (options) Privacy