Fuel Pump relay in '94 S-10 Blazer? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hoods69BadBowTie · 09-29-2008, 10:27 PM

I think my dads fuel pump went out. He wants to check the fuel pump relay before we do the pump. We already checked all the fuses they were good. Any other ideas? I am wondering where exactly we should look for the relay at? Thanks in advance

Longhorn Man · 09-29-2008, 10:39 PM

94 would be the first gen, or square body IIRC.... I'm 99% positive it's one of the two relays on the upper firewall close to the brake booster. (it has been 6 or 7 years since I messed with the relay on one)
BTW... have fun with that job. The connections that you need to get to on the fuel lines, are on top of the tank, and they are on hardlines.
Yeah... another one of GM's great ideas. They loaded the poS-10 with LOTS of great ideas.

corn · 09-30-2008, 12:10 AM

'94 is actually a 2nd gen but Im not sure where the relay is. On my '96 its in the back of the glove box. Open the glove box & see if there is a removable cover in there. Going through the same thing on my '96 right now...

**truckdude239** · 09-30-2008, 07:20 AM

you could alway pull the bed off and get to the top of the tank thats way lol

fastwillie 696969 · 09-30-2008, 08:11 AM

Quote:

Originally Posted by truckdude239

you could alway pull the bed off and get to the top of the tank thats way lol

its the fastest way to change them out there only like 10 bolts to undo the bed
i know at ford we were lifting the whole body off the frame to change heads on the excusion with the 5.4 l

fastwillie 696969 · 09-30-2008, 10:37 AM

On your 1994 Chevrolet Truck S10 Blazer 2WD 4.3L CPI , the Relay - Fuel Pump is located:

Front seating area, driver side, driver side of steering column, behind instrument cluster, mounted in convenience center

for the fuel lines heres a tool dia.

Hoods69BadBowTie · 09-30-2008, 01:25 PM

What do you mean pull the bed off? its a Blazer. I know I can't wait to do it we are getting ready to go do it pretty soon. Wish me luck!

Longhorn Man · 09-30-2008, 04:45 PM

the first gen for s-10 pick up was 82 - 93.... the first gen for s-10 Blazer was 83 - 94

corn · 09-30-2008, 04:52 PM

Quote:

Originally Posted by Longhorn Man

the first gen for s-10 pick up was 82 - 93.... the first gen for s-10 Blazer was 83 - 94

Yep, I was one of the others that missed the "Blazer" part too. My bad...

narftroz · 11-29-2009, 10:37 PM

Relay is on the left then the horn then the fog lights on the right (if equipped)
hope that helps.

70BLAZERX2 · 02-13-2010, 11:41 AM

The fuel pump relay is mounted under the hood,just to the right above the brake booster...there are 2 the same side by side,you can try switching them to test if it will work,It may be the pump itseld and you have to drop the tank to change that.

One more thing to check,if you have an oil leak at the oil pressure switch located by the distributor,this can cause the fuel pump not to run, All gm injected motors have a run safe built in,if oil pressure drops below 7 psi,it will shut down the fuel must circuit.

I have worked on these 92-95 CPI blazers for years...I just biult a 93 S10 with the 4.3 "W" motor in is, see pics of 93 S10 Vortec Build "w" on here.

Take a block of wood and smack the bottom of fuel tank, then listen to see if the pump runs then,if it does change the pump. And dont go aftermarket with the CPI pump, go a/c delco..unless you want low power and have to do it twice,the aftermarket pumps are universal , this needs 67 psi to open the injector up..Done to many and know its no fun to drop the tank 1 time let alone 2 ,3 ,4 you get it...

drivewaycustoms · 02-13-2010, 11:24 PM

^^^this guy is 100% correct. I've had to put a fuelpump in almost every blazer that I've had (7) and it is a real pain.

09-29-2008, 10:27 PM	#1
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	Fuel Pump relay in '94 S-10 Blazer? I think my dads fuel pump went out. He wants to check the fuel pump relay before we do the pump. We already checked all the fuses they were good. Any other ideas? I am wondering where exactly we should look for the relay at? Thanks in advance __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

09-29-2008, 10:39 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Fuel Pump relay in '94 S-10 Blazer? 94 would be the first gen, or square body IIRC.... I'm 99% positive it's one of the two relays on the upper firewall close to the brake booster. (it has been 6 or 7 years since I messed with the relay on one) BTW... have fun with that job. The connections that you need to get to on the fuel lines, are on top of the tank, and they are on hardlines. Yeah... another one of GM's great ideas. They loaded the poS-10 with LOTS of great ideas.

09-30-2008, 12:10 AM	#3
corn Registered User Join Date: Dec 2003 Location: here Posts: 5,789	Re: Fuel Pump relay in '94 S-10 Blazer? '94 is actually a 2nd gen but Im not sure where the relay is. On my '96 its in the back of the glove box. Open the glove box & see if there is a removable cover in there. Going through the same thing on my '96 right now...

09-30-2008, 07:20 AM	#4
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: Fuel Pump relay in '94 S-10 Blazer? you could alway pull the bed off and get to the top of the tank thats way lol __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

09-30-2008, 10:37 AM	#6
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	Re: Fuel Pump relay in '94 S-10 Blazer? On your 1994 Chevrolet Truck S10 Blazer 2WD 4.3L CPI , the Relay - Fuel Pump is located: Front seating area, driver side, driver side of steering column, behind instrument cluster, mounted in convenience center for the fuel lines heres a tool dia. Attached Images __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex Last edited by fastwillie 696969; 09-30-2008 at 10:40 AM.

09-30-2008, 01:25 PM	#7
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	Re: Fuel Pump relay in '94 S-10 Blazer? What do you mean pull the bed off? its a Blazer. I know I can't wait to do it we are getting ready to go do it pretty soon. Wish me luck! __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

09-30-2008, 04:45 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Fuel Pump relay in '94 S-10 Blazer? the first gen for s-10 pick up was 82 - 93.... the first gen for s-10 Blazer was 83 - 94

11-29-2009, 10:37 PM	#10
narftroz Registered User Join Date: Nov 2009 Location: Apache Junction, AZ Posts: 1	Re: Fuel Pump relay in '94 S-10 Blazer? Relay is on the left then the horn then the fog lights on the right (if equipped) hope that helps.

02-13-2010, 11:41 AM	#11
70BLAZERX2 Registered User Join Date: Jan 2010 Location: GREENEVILLE TENNESSEE Posts: 1,310	Re: Fuel Pump relay in '94 S-10 Blazer? The fuel pump relay is mounted under the hood,just to the right above the brake booster...there are 2 the same side by side,you can try switching them to test if it will work,It may be the pump itseld and you have to drop the tank to change that. One more thing to check,if you have an oil leak at the oil pressure switch located by the distributor,this can cause the fuel pump not to run, All gm injected motors have a run safe built in,if oil pressure drops below 7 psi,it will shut down the fuel must circuit. I have worked on these 92-95 CPI blazers for years...I just biult a 93 S10 with the 4.3 "W" motor in is, see pics of 93 S10 Vortec Build "w" on here. Take a block of wood and smack the bottom of fuel tank, then listen to see if the pump runs then,if it does change the pump. And dont go aftermarket with the CPI pump, go a/c delco..unless you want low power and have to do it twice,the aftermarket pumps are universal , this needs 67 psi to open the injector up..Done to many and know its no fun to drop the tank 1 time let alone 2 ,3 ,4 you get it... Last edited by 70BLAZERX2; 02-13-2010 at 11:43 AM.

02-13-2010, 11:24 PM	#12
drivewaycustoms Registered User Join Date: Jan 2007 Location: Waldorf,MD Posts: 308	Re: Fuel Pump relay in '94 S-10 Blazer? ^^^this guy is 100% correct. I've had to put a fuelpump in almost every blazer that I've had (7) and it is a real pain. __________________ 87 Crewcab Dually 66 Cadillac Sedan deVille 55 Chevy Belair 33 Plymouth sedan 03 S-10 86 S-10 Blazer _____________________________________________ IG drivewaycustoms

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