Question about 1998 GMC Jimmy

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Voltage to fuel pump

I have a 1998 gmc jimmy that is getting only 5.0 volts to the fuel pump. i have checked all grounds.relays, & fuses. i have also repaced ecc unit.

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U need to see what the voltage is on the fuel pump fuse ? If that is only 5 volts also you will probably need to replace the ignition switch .

Posted on Jun 17, 2009

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1 Answer

Fuse box diagram


Make sure the ground is good, that truck was known for a bad connector near the Trannie cross member. Find your plug at fuel pump,4 wires..2 black, gray and purple. Black and purple are for the float. Gray is power to pump, black with yellow is ground for pump. When key is turned grey wire gets power check good ground . If power and grounds are good replace pump if not fix ground or replace relay

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1 Answer

Replaced fuel pump now no power to pump


If you unplug the connector for the pump, you should have battery voltage on the pump circuit from the relay for 3 seconds. You would have 5 or 6 volts for the gauge sending unit.
You should be able to jumper the pump relay and get 12 volts at the pump connector.

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Dodge 1500 1995 pickup 7.5 volts to fuel pumpwill not start applied 12 volts pump runs book sayes pcm de-energize booth relayes and will not send proper voltage to fuel pump


There is a red and white wire feeding the fuel pump relay from a 30 amp fuse. Both the shutdown relay and the fuel pump relay are grounded by the PCM, so if the fuel pump relay is grounded it should be "on" and providing a direct link from the pump to that fuse.
You should have battery voltage on that 30 amp wire before the relay and then on the dark green and black wire going to the pump.
If you don't have battery voltage coming from the 30 amp fuse, the problem could be before the fuse.
That 30 amp fuse is hot all the time, so it is powered by a fuseable link coming off the battery.

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1998 gmc jimmie 4.3, 2 wd. wont start. getting no gas at the fuel bleeder valve. has new fuel pump and new fuel filter. started and ran fine after new pump and filter install. drove 15 miles and parked all...


Check to see if fuel is getting to the filter. Maybe too much dirt in lines & plugged filter? If fuel at filter, put hose in place of filter JUST LONG enough to see if fuel is getting to fuel rail.

Mar 15, 2011 | 1998 GMC Jimmy

1 Answer

Kmboogieman7cant get my truck to start. might be the the fuel pump, but i i need to check the fuel relay valve switch, i cant find it;. I have a 1998 GMC jimmy.


Can you hear the pump running? If not why not check for power to the pump on the grey wire. Get as close to the pump as possible. If there is power you just confirmed the fuse, relay, and wiring are all good.

The relay is located on the firewall behind the plastic cover that usually has something like electrical center written on it.

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Oil pressure switch activates the supply pump. Replace the oil pressure switch.. New & Need good rating please.

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if there is no power to the fuel pump check relays and fuses....UNDERHOOD FUSE & RELAY PANEL IDENTIFICATION Fig. 2: Underhood Fuse & Relay Panel Identification Courtesy of ISUZU MOTOR CO. Fusible Link Identification ? A - 80 Amp (1991-92 3.1L) ? A - 60 Amp Main-1 ? B - 30 Amp Main-2 ? C - 30 Amp (1993-94) ECM (3.2L) ? D - 30 Amp Condenser Fan (A/T Models) Relay Identification ? 1 - Headlight Relay ? 2 - A/C - Heater Relay ? 3 - Starter Relay ? 4 - A/C Compressor Relay ? 5 - Charge Relay ? 6 - Fuel Pump Relay ? 7 - ECM Relay ? 8 - Wiper Relay Fuse & Circuit Breaker Identification ? 1 - 15 Amp (1991) ECM, Fuel Injection System ? 1 - 15 Amp (1992-94 2.6L) ECM, Fuel Injection System ? 1 - 10 Amp (1992-94 3.1 & 3.2L) Heated Oxygen Sensor, Fuel Injection System ? 2 - 20 Amp (1991-92) Fuel Pump ? 2 - 20 Amp (1993-94 2.6L) Fuel Pump ? 2 - 15 Amp (1993-94 3.2L) Fuel Pump ? 3 - 10 Amp (1991) ? 3 - 15 Amp (1992-94) Turn Signal Lights, Hazard Warning Flasher Lights ? 4 - 10 Amp Horn, Door Locks ? 5 - Not Used (1991 3.1L) ? 5 - 10 Amp Charging System, Charge Warning Light WARNING: Always disconnect battery ground cable before servicing "high- current fuses. It is recommended that "high-current" fuses be replaced by a qualified technician. Page 1 of 2 FUSES & CIRCUIT BREAKERS -1994 Isuzu Rodeo LS? 6 - Not Used (1991) (1992-93 2.6L) ? 6 - 10 Amp (1992-94 3.1L & 3.2L) A/T Interlock System ? 6 - 10 Amp (1994 2.6L) Heated Oxygen Sensor, Fuel Injection System ? 7 - 20 Amp Heater/Air Conditioning Blower Controls ? 8 - 10 Amp Air Conditioner Compressor Controls ? 9 - 10 Amp Right Headlight ? 10 - 10 Amp Left Headlight © 2008 Mitchell Repair Information Co., LLC.
62217_isuzfuse_1.jpg
Underhood fuse block swap out relay #7 thats the ECM relay.
Ground Circuits Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion and loose connection on ground lead. See ECM GROUND LOCATION table for ECM ground location.
Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo

Mar 28, 2010 | 1993 Isuzu Rodeo

1 Answer

1997 Gmc yukon fuel relay switch continues to burn out. Replaced fuel pump twice and also took it the dealer but no solutions. Truck runs fine for sometimes weeks but the problem continues.


I would have to check the fuel pump with a scope to look at the pattern and check the amps it is drawing . the grounds need to be checked and the pcm checked and reflashed. on the fuel system that would affect the fuel pump and relay to where it would burn it out is grounds , pcm , fuel pump , fuel pump relay. so you should convince them to replace the fuel pump and fuel pump relay under warranty and replace the pcm . and get a diagram and check all grounds. If the pcm is damaged and the current has been affected and instead of say a 5 volt or 2 volt signal it now has a 13.5 volt signal or if a ground is out then the temp of the relay will keep rising non energized a relay is about 99 energized it is around 140 you can check to see how hot that relay is getting. and if i remember correctly you want the pcm drivers checked.

Jun 17, 2009 | 2001 GMC Yukon XL

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