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Fuel pump

Tiny
REGGIENEU
  • MEMBER
  • 2002 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 114,000 MILES
I live in Wisconsin. I took my blazer into the shop at the beginning of May to have a new fuel pump put in. At which time wouldn't start after that. I had a new ignition coil put right along with new wires and mapf sensor and temp air control sensor put in also. Brought vehicle home ran 2 days and died. Took back to shop 2 different times with the same situation. This last time we had a new fuel pump put in again.(Different one) Again drove for 2 days and died again. Have any ideas why I would be burning fuel pumps this quick?
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Friday, September 5th, 2008 AT 9:52 AM

81 Replies

Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
When the pumps were replaced did the shop also replace the connector pigtail? If not low voltage to the pump may be causing problems. It is a common problem and most of the pumps come with the new connectors.

It could also be a bad regulator that is failing.

What does the fuel pressure read with the key on engine off? How about with the engine running? When you shut off the engine what does the fuel pressure do?
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Saturday, September 6th, 2008 AT 1:11 PM
Tiny
REGGIENEU
  • MEMBER
  • 3 POSTS
I'm guessing the pig tail was replaced. The mechanic I had claimed he replaced a lot of wiring.

As far as the pressure with the key off, I'm not sure. When it idled it was at 45 psi. And when it was starting it dropped to 25 psi. Didn't say what happened when he shut it off either.

I had another mechanic look at it. And he ended up changing out the wiring harness. Seems to help so far.
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Saturday, September 6th, 2008 AT 3:00 PM
Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
45 PSI is WAY low. You should see 55-65 key on engine off and at least 55-56 running PSI. I would have them test for a faulty regulator. Sounds like either the regulator is bad or you have a fuel leak in the manifold. What mileage have you been getting?
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Monday, September 8th, 2008 AT 10:35 PM
Tiny
PHILLIP75
  • MEMBER
  • 1 POST
  • 2002 CHEVROLET BLAZER
2002 Chevy Blazer Four Wheel Drive Automatic

What is the color of the ground wire for my trucks Fuel pump. I need to check the gound and see it thare is a break in the line some whare
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The black wire is the ground also see below


https://www.2carpros.com/forum/automotive_pictures/12900_ground_1.jpg

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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
The wire color for the ground is black. The gray wire is voltage to the pump.
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
MKCKARRICK
  • MEMBER
  • 7 POSTS
  • 1998 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 132,000 MILES
My blazer been running little rough.I put new plug in and new rotor and rotor cap new plugs wires. That did not help. So then I went to check my fuel pressure. With key on pump running psi 62 with pump off psi 56 with car running 56 psi. Get car about 2000 rpm psi about 60. Plz help thanks matthew
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Fuel pressure seems ok, scan for codes and check for vacuum leaks.
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
MKCKARRICK
  • MEMBER
  • 7 POSTS
I check for links and did not find any and there is no codes
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
MKCKARRICK
  • MEMBER
  • 7 POSTS
I forgot to till you this. When I come to a stop and and then I take off car accl really slow.I really can not pass a car right now because I can't get up to speed fast enougth
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure again with a gauge auto parts rent it. If it stays below 60 replace the pump and check for a bad regulator. Start car with gauge on, open throttle quickly it should go up to 66 psi if not replace pump and filter. Check vacuum at idle at manifold if 15" or below suspect clogged exhaust.
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
CHRIS1469
  • MEMBER
  • 6 POSTS
  • 1998 CHEVROLET BLAZER
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Will a fuel pump for a 1999 Jimmy/two door fit my vehicle listed above? It is a four door.
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
MKCKARRICK
  • MEMBER
  • 7 POSTS
I check fuel pressure and it was 62 psi as soon pump went off it drop to about 56 psi.I talk to my friends dad he a chevy expret and he said fule pump psi should be 60 to 66 psi. With car running it should be about 62 psi. So he said fuel pump is bad
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
BACKYARDMECHANICPRO
  • MEMBER
  • 6 POSTS
Yes will fit like a glove GMC Jimmy and Chevrolet Blazer are identical part wise Chevrolet makes GMC, just different make and model. And only being a year difference you will not have any problems.
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
MKCKARRICK
  • MEMBER
  • 7 POSTS
Ok I had my car look at by 3 shops this week. And they all said I need a new fuel pump.I get new pump put in and still getting low fuel pressure 62 psi with key on soon pump goes off it drops to 56 psi. With car running at idle it's around 56 psi.I did a link down test and in 30 mins psi was still at 56.I really don't know where to start now.
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
CHRIS1469
  • MEMBER
  • 6 POSTS
Cool. Thanks
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try the regulator it will either be inside or outside of intake.
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
MKCKARRICK
  • MEMBER
  • 7 POSTS
I done a leak down test today psi was 60 and 10 mins it was 52 psi and I let it set 10 more mins it went from 52 psi to 44 psi
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
DAVIDB420
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET BLAZER
I have a 1998 chevy blazer but I cannot get power to the fuel pump
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)
Tiny
GM-TECH
  • MEMBER
  • 11 POSTS
Did you check all the fuses a nd relay?
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Thursday, August 22nd, 2019 AT 6:31 PM (Merged)

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