97 blazer 4.3 fuel problem! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Cyclone44 · 05-24-2009, 10:17 PM

I have a 97 blazer that I just bought for Sharon and if it sits for awhile it just will not start back....If you prime it, it will fire right up....So it's like the fuel is running back into the tank....Is a new fuel pump the answer?

Arad68 · 05-25-2009, 12:26 PM

I would check the fuel pressure first. It does sound like the pump or fuel pressure regulator.

Arad68 · 05-25-2009, 12:38 PM

Here is a link to the manual on Amazon.

Amazon.com: Haynes Manuals - Chevrolet S-10 &...

Cyclone44 · 05-25-2009, 12:55 PM

How hard is the fuel preasure regulator to change?....We have a 98 with the same motor in it on our impound lot that has one.....It has been there long enough that it can be parted.....It was running just had all of the glass beat out of it.....

Arad68 · 05-25-2009, 12:58 PM

Quote:

Originally Posted by Arad68

Here is a link to the manual on Amazon.

Amazon.com: Haynes Manuals - Chevrolet S-10 & GMC Sonoma Pick-ups (94 - 04); Chevrolet Blazer & GMC Jimmy (95 - 04); Olds Bravada & Isuzu Hombre (96 - 01) Manual (24071): Automotive

Here is a better link.

Amazon.com: Haynes Manuals - Chevrolet S-10 &...

Damien · 05-27-2009, 07:13 PM

Sounds like a fuel pres. reg. I'm not sure what that one is like to change.

Cyclone44 · 05-27-2009, 07:47 PM

Quote:

Originally Posted by Damien

Sounds like a fuel pres. reg. I'm not sure what that one is like to change.

Is there any particular reason that you think that is my problem?....Thanks

corn · 05-27-2009, 11:32 PM

This looks like it might be worth a try...

http://chevroletforum.com/forum/arch...p/t-12645.html

68C15 · 05-28-2009, 06:51 AM

sounds like a fuel volume issue. keep in mind these need at least 58PSI to start. I would have to check on the volume specs but without the $400 tester you have no way to check it. I bought mine from www.fuelsender.com

this is the one I got
http://www.fuelsender.com/fuel_system_analyzer.html

Cyclone44 · 05-28-2009, 08:51 AM

Quote:

Originally Posted by corn

This looks like it might be worth a try...

http://chevroletforum.com/forum/arch...p/t-12645.html

Thanks Corn, but I do know that it is a fuel problem because you can prime it and it will fire right up....

Cyclone44 · 05-28-2009, 08:53 AM

Quote:

Originally Posted by 68C15

sounds like a fuel volume issue. keep in mind these need at least 58PSI to start. I would have to check on the volume specs but without the $400 tester you have no way to check it. I bought mine from www.fuelsender.com

this is the one I got
http://www.fuelsender.com/fuel_system_analyzer.html

Thanks, I really want to put the fuel preasure regulator on it and try that...

Chatterbox71 · 05-29-2009, 09:56 PM

You better hurry up slacker.

Damien · 05-29-2009, 10:49 PM

The fuel pressure regulator holds pressure in the line. If the diaphragm leaks, you will have poor fuel economy and a hard start issue if the vehicle sits. If the engine is turned off, it will restart fine. An easy way to check for a bad FPR is to pull the vacuum line off. If there is fuel in the line, its bad.

68C15 · 05-30-2009, 06:53 AM

problem is 96 and newer are SCPI meaning the injectors and regulator are mounted inside the upper intake. they don't have a vacuum hose, it gets its reference directly from the area around it. you can generally see them leaking by removing the throttle body and energizing the pump.

BTW, speaking of pumps. these have 2 impellers. one to fill the well and one to create pressure. I diagnose them by using the tester i mentioned before and also with a low amps probe clamped to the power wire. I look at the pump power wave form and check pump speed, current draw, and integrity of the commutator.

05-24-2009, 10:17 PM	#1
Cyclone44 Step Brother Join Date: Sep 2007 Location: K-town Posts: 4,029	97 blazer 4.3 fuel problem! I have a 97 blazer that I just bought for Sharon and if it sits for awhile it just will not start back....If you prime it, it will fire right up....So it's like the fuel is running back into the tank....Is a new fuel pump the answer?

05-25-2009, 12:26 PM	#2
Arad68 Trucks N Tranzams Join Date: Dec 2002 Location: North Las Vegas, Nevada Posts: 816	Re: 97 blazer 4.3 fuel problem! I would check the fuel pressure first. It does sound like the pump or fuel pressure regulator. __________________ Don '68 Chevy LB 383 TH400/GV/373 posi '56 Chevy 4WD SWB '64 Chevy short stepside '79 Trans Am 455/TH2004R/12blt/4whldisc 95 Kia (Wifes car) 2002 S-10 extended cab pickup "God punishes small sins immediately"

05-25-2009, 12:38 PM	#3
Arad68 Trucks N Tranzams Join Date: Dec 2002 Location: North Las Vegas, Nevada Posts: 816	Re: 97 blazer 4.3 fuel problem! Here is a link to the manual on Amazon. Amazon.com: Haynes Manuals - Chevrolet S-10 &... __________________ Don '68 Chevy LB 383 TH400/GV/373 posi '56 Chevy 4WD SWB '64 Chevy short stepside '79 Trans Am 455/TH2004R/12blt/4whldisc 95 Kia (Wifes car) 2002 S-10 extended cab pickup "God punishes small sins immediately"

05-25-2009, 12:55 PM	#4
Cyclone44 Step Brother Join Date: Sep 2007 Location: K-town Posts: 4,029	Re: 97 blazer 4.3 fuel problem! How hard is the fuel preasure regulator to change?....We have a 98 with the same motor in it on our impound lot that has one.....It has been there long enough that it can be parted.....It was running just had all of the glass beat out of it.....

05-27-2009, 07:13 PM	#6
Damien Registered User Join Date: Mar 2007 Location: Farmington, MN Posts: 928	Re: 97 blazer 4.3 fuel problem! Sounds like a fuel pres. reg. I'm not sure what that one is like to change. __________________ I can still count my vehicles on two... wait three hands.

05-27-2009, 11:32 PM	#8
corn Registered User Join Date: Dec 2003 Location: here Posts: 5,789	Re: 97 blazer 4.3 fuel problem! This looks like it might be worth a try... http://chevroletforum.com/forum/arch...p/t-12645.html Last edited by corn; 05-27-2009 at 11:33 PM. Reason: I cant spell

05-28-2009, 06:51 AM	#9
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	Re: 97 blazer 4.3 fuel problem! sounds like a fuel volume issue. keep in mind these need at least 58PSI to start. I would have to check on the volume specs but without the $400 tester you have no way to check it. I bought mine from www.fuelsender.com this is the one I got http://www.fuelsender.com/fuel_system_analyzer.html Last edited by 68C15; 05-28-2009 at 06:54 AM.

05-29-2009, 09:56 PM	#12
Chatterbox71 Registered User Join Date: May 2009 Location: Knoxville Tn. Posts: 45	Re: 97 blazer 4.3 fuel problem! You better hurry up slacker. __________________ Cyclone44's girl Sharon...

05-29-2009, 10:49 PM	#13
Damien Registered User Join Date: Mar 2007 Location: Farmington, MN Posts: 928	Re: 97 blazer 4.3 fuel problem! The fuel pressure regulator holds pressure in the line. If the diaphragm leaks, you will have poor fuel economy and a hard start issue if the vehicle sits. If the engine is turned off, it will restart fine. An easy way to check for a bad FPR is to pull the vacuum line off. If there is fuel in the line, its bad. __________________ I can still count my vehicles on two... wait three hands.

05-30-2009, 06:53 AM	#14
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	Re: 97 blazer 4.3 fuel problem! problem is 96 and newer are SCPI meaning the injectors and regulator are mounted inside the upper intake. they don't have a vacuum hose, it gets its reference directly from the area around it. you can generally see them leaking by removing the throttle body and energizing the pump. BTW, speaking of pumps. these have 2 impellers. one to fill the well and one to create pressure. I diagnose them by using the tester i mentioned before and also with a low amps probe clamped to the power wire. I look at the pump power wave form and check pump speed, current draw, and integrity of the commutator.



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