How to tell if my fuel pump is going out. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

richards72chevy · 03-13-2013, 09:57 PM

My wifes 01 blazer stalled out on her today.She made it home.I took it on a drive and it ran fine for a few miles then the rpm dropped to 1500 then 500 then it died.I was lucky because it broke down in front of my grand parents house.It restarted but it was popping and running rough for a minute died and wouldnt restart.I let sit for a little bit it would turn over but not start.I could hear the pump coming on.I poured some gas down the throttle body it fired rite up.I could hear the pump running.I can also hear the engine stop running for just a second and the fuel pump quits making noise.The problem is it happens so fast i cant tell if the pump is making the engine stop running or if it would be something in the ignition.How could i tell?I replaced the fuel pump 2 years/30,000 miles ago.

cAlvis165 · 03-13-2013, 10:16 PM

My 2000 Suburban was acting a lot like you describe. I had to put a pressure gauge on it to diagnose it. I looked up the correct pressure for my vehicle online, and then turned the key on with my pressure gauge hooked up. I was supposed to have ~50psi and had 9.

I would check you fuel filter if you haven't already. It should be on drivers side frame rail (inside) right in front of bed. A real dirty filter can choke the supply off enough that the engine will have a hard time running. Also, if you have a 6 cylinder, you may want to try replacing the fuel pressure regulator. Approx. $44.00, but you don't have to drop the tank. If you pump is bad, unfortunately, a lot of pumps only have a one year warrenty...

richards72chevy · 03-13-2013, 10:46 PM

I checked my warranty and its only one year.Is there a way to check the regulator?What kind of truck is that in your avatar calvis165?I like it.

cAlvis165 · 03-13-2013, 11:21 PM

There is a diaphragm in the regulator and when it goes bad, it let fuel up through the regulator body and into the vacuum port. Typically you would pull the vacuum hose off you fuel regulator while the vehicle is running and hold your thumb over the hose. If you regulator is bad, fuel will come out of the hose port on the regulator. May take a while before fuel comes out, so be patient.

You have to remove the upper intake manifold on the 4.3 to get to the fuel pressure regulator...so I'm not sure if the normal troubleshooting technique would apply.

Here is a link that may help you.

http://www.justanswer.com/chevy/32wn...-2001-s10.html

Pic of Upper intake manifold removal...

Hope this helps!

My truck is a 1965 International Harvester 1 ton 4x4. It's a lot of fun!

**truckdude239** · 03-18-2013, 09:03 AM

get an ac delo pump no other pump will last like the ac delo i've replace numerous after market pumps after only a year or 2 of year they just dont last the same

richards72chevy · 03-19-2013, 06:06 AM

Its not fuel.Im not getting any spark or its a week spark.

richards72chevy · 03-19-2013, 06:20 AM

Do you guys think its is a faulty coil or module?I don't know if a bad camshaft or crank shaft sensor would cause these problems.

03-13-2013, 09:57 PM	#1
richards72chevy Registered User Join Date: Dec 2010 Location: konawa ok/oakdale Ca. Posts: 1,648	How to tell if my fuel pump is going out. My wifes 01 blazer stalled out on her today.She made it home.I took it on a drive and it ran fine for a few miles then the rpm dropped to 1500 then 500 then it died.I was lucky because it broke down in front of my grand parents house.It restarted but it was popping and running rough for a minute died and wouldnt restart.I let sit for a little bit it would turn over but not start.I could hear the pump coming on.I poured some gas down the throttle body it fired rite up.I could hear the pump running.I can also hear the engine stop running for just a second and the fuel pump quits making noise.The problem is it happens so fast i cant tell if the pump is making the engine stop running or if it would be something in the ignition.How could i tell?I replaced the fuel pump 2 years/30,000 miles ago.

03-13-2013, 10:16 PM	#2
cAlvis165 Registered User Join Date: Aug 2011 Location: N.E. OH Posts: 214	Re: How to tell if my fuel pump is going out. My 2000 Suburban was acting a lot like you describe. I had to put a pressure gauge on it to diagnose it. I looked up the correct pressure for my vehicle online, and then turned the key on with my pressure gauge hooked up. I was supposed to have ~50psi and had 9. I would check you fuel filter if you haven't already. It should be on drivers side frame rail (inside) right in front of bed. A real dirty filter can choke the supply off enough that the engine will have a hard time running. Also, if you have a 6 cylinder, you may want to try replacing the fuel pressure regulator. Approx. $44.00, but you don't have to drop the tank. If you pump is bad, unfortunately, a lot of pumps only have a one year warrenty... __________________ Success is not final, failure is not fatal: it is the courage to continue that counts. Winston Churchill DD 2000 Chevy Suburban 4x4/5.3 Vortec/4L60E/4:10s, 18" Escalade rims, Electric fans Project Dooley One-Ton 4x4 on 38.5s Corn-binder build

03-13-2013, 10:46 PM	#3
richards72chevy Registered User Join Date: Dec 2010 Location: konawa ok/oakdale Ca. Posts: 1,648	Re: How to tell if my fuel pump is going out. I checked my warranty and its only one year.Is there a way to check the regulator?What kind of truck is that in your avatar calvis165?I like it.

03-13-2013, 11:21 PM	#4
cAlvis165 Registered User Join Date: Aug 2011 Location: N.E. OH Posts: 214	Re: How to tell if my fuel pump is going out. There is a diaphragm in the regulator and when it goes bad, it let fuel up through the regulator body and into the vacuum port. Typically you would pull the vacuum hose off you fuel regulator while the vehicle is running and hold your thumb over the hose. If you regulator is bad, fuel will come out of the hose port on the regulator. May take a while before fuel comes out, so be patient. You have to remove the upper intake manifold on the 4.3 to get to the fuel pressure regulator...so I'm not sure if the normal troubleshooting technique would apply. Here is a link that may help you. http://www.justanswer.com/chevy/32wn...-2001-s10.html Pic of Upper intake manifold removal... Hope this helps! My truck is a 1965 International Harvester 1 ton 4x4. It's a lot of fun! __________________ Success is not final, failure is not fatal: it is the courage to continue that counts. Winston Churchill DD 2000 Chevy Suburban 4x4/5.3 Vortec/4L60E/4:10s, 18" Escalade rims, Electric fans Project Dooley One-Ton 4x4 on 38.5s Corn-binder build

03-18-2013, 09:03 AM	#5
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: How to tell if my fuel pump is going out. get an ac delo pump no other pump will last like the ac delo i've replace numerous after market pumps after only a year or 2 of year they just dont last the same __________________ 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

03-19-2013, 06:06 AM	#6
richards72chevy Registered User Join Date: Dec 2010 Location: konawa ok/oakdale Ca. Posts: 1,648	Re: How to tell if my fuel pump is going out. Its not fuel.Im not getting any spark or its a week spark.

03-19-2013, 06:20 AM	#7
richards72chevy Registered User Join Date: Dec 2010 Location: konawa ok/oakdale Ca. Posts: 1,648	Re: How to tell if my fuel pump is going out. Do you guys think its is a faulty coil or module?I don't know if a bad camshaft or crank shaft sensor would cause these problems.



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