2000 blazer doesnt hold fuel pressure :confused: - Pirate4x4.Com : 4x4 and Off-Road Forum
 
Pirate4x4.Com : 4x4 and Off-Road Forum  

Go Back   Pirate4x4.Com : 4x4 and Off-Road Forum > Brand Specific Tech > Chevy
Notices

Reply
 
Share Thread Tools Display Modes
Old 07-07-2005, 08:03 AM   #1 (permalink)
Granite Guru
 
kmkommes's Avatar
 
Join Date: Aug 2004
Member # 34955
Location: Oshkosh, WI
Posts: 781
2000 blazer doesnt hold fuel pressure :confused:

I have a 2000 zr2 blazer with a 4.3 It has been really tricky to start ever since I got it. If you let it sit for awhile and try to start it it turns over a couple times before it fires. If I turn the key on and let the fuel pump run for 2 seconds, then start it , it seems to start better. Sometimes it will fire right up, sometimes it turns over 1 or 2 times first.

I know its not the fuel pump. The pump runs just fine. I put a fuel pressure gauge on it yesterday and it shows 55-60 when the fuel pump is running, but the second the fuel pump stops running the pressure drops to zero. So I am wondering why the pressure keeps dropping and if it suppose to or not.

When running the blazer runs just fine and has 55 psi or so. Gas mileage has also been consistently getting worse. I used to get 19, now I get 16. Whats the deal?
kmkommes is offline   Reply With Quote
Old 07-07-2005, 08:50 PM   #2 (permalink)
Wheeler
 
Join Date: Nov 2004
Member # 38880
Location: Phoenix Az.
Posts: 252
Most likely a leaking fuel pressure regulator. Remove the air intake tube and open the throttle plate all the way with engine off use a flash light to see if the floor of the intake is nice ands clean if it is or you smell alot of fuel replace the fuel pressure regulator. The other option is to use a fuel pressure guage ont the vehicle and turn the key on after pump stops runningpich off bothe the return and the feed fuel line if guage holds the pressure steady the problem is the pump. If it doesnt hold pressure it could be an injector or regulator most likely the regulator. My .02$
3/4ton62gmc is offline   Reply With Quote
Sponsored Links
Old 07-07-2005, 09:39 PM   #3 (permalink)
Registered User
 
Join Date: Sep 2002
Member # 13786
Location: moved 7 miles to colfax, ca.
Posts: 4,299
It is quite common for the regulators to go out on those, do the above check for fuel, if bad you have to pull the top half of the intake manifold. The regulator is inside with a spider looking injectors connected to it.
KWTMECH is offline   Reply With Quote
Old 07-08-2005, 06:21 PM   #4 (permalink)
Registered User
 
Join Date: Jun 2005
Member # 49519
Posts: 78
Vortechs are notorious for leaking fuel pressure regulators, you're lucky you have a 4.3, replacing the one on my 7.4 was a pain in the ass.
Traveller is offline   Reply With Quote
Old 07-10-2005, 11:05 AM   #5 (permalink)
Registered User
 
Join Date: Jun 2005
Member # 49359
Location: Portland OR
Posts: 5
Alot of times the pressure will look OK when you test it but if doesnt hit the target press almost instantly it will start dying and be hard to start.
Me and My Toys is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 06:00 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 ©2011, Crawlability, Inc.