Full Size K5 (1969-1991) GMT415 (1992-1994) Tech Discuss any and all full size K5 general tech topics here.

89 K5 Blazer starts right up , idles for 3seconds and dies..

  #1  
Old 01-17-2010, 10:05 PM
Beginning Member
Thread Starter
Join Date: Jan 2010
Posts: 22
blbikerood is on a distinguished road
Default 89 K5 Blazer starts right up , idles for 3seconds and dies..

We put in a new fuel filter didn't work. Pulled the main fuel line going into the tbi and when you hit the key barely any fuel came out. but some did. shouldn't it spray? Could this be egr valve? Or fuel pump. You can hear the pump come on when you hit the key, but i am thinking it isn't getting enough pressure. I am getting the blazer from a friend 70 miles away. I have drove twice now and haven't come home with it. I would love to go prepared tommorow so I will end up with it home tommorow. Any help will be greatly appreciated. It is a 350FI, appears to be pretty stock. If it is the fuel pump, are there any instructions online to remove and replace it. Thank you.
 
  #2  
Old 01-17-2010, 10:06 PM
swartlkk's Avatar
Administrator
Join Date: May 2005
Location: Waterloo, NY
Posts: 40,803
swartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond repute
Default

You need 8-10 psi for a TBI motor. You should verify the pressure with an inline gauge fitting. Some of the more expensive fuel pressure gauge setups come with the proper fitting.
 
  #3  
Old 01-17-2010, 10:08 PM
Beginning Member
Thread Starter
Join Date: Jan 2010
Posts: 22
blbikerood is on a distinguished road
Default thanks for the fast reply

where do i get one and where do i hook it up. On the main fuel line behind the tbi?/
 
  #4  
Old 01-17-2010, 10:17 PM
swartlkk's Avatar
Administrator
Join Date: May 2005
Location: Waterloo, NY
Posts: 40,803
swartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond repute
Default

You should be able to pick up a fuel pressure gauge from any autoparts store. Just check that it comes with the proper fitting before purchasing it.

And yes, the inline adapter fitting goes between the throttle body and the main line into the throttle body.
 
  #5  
Old 01-17-2010, 10:31 PM
Beginning Member
Thread Starter
Join Date: Jan 2010
Posts: 22
blbikerood is on a distinguished road
Default I'll try that tommorow

Does it sound like a fuel pump to you>?
 
  #6  
Old 01-18-2010, 10:47 AM
Beginning Member
Join Date: Nov 2009
Location: rocklin ca
Posts: 32
lineman1211 is on a distinguished road
Default Fuel pump

If you want to try a cheap fix, change the filter, quick and easy. That might help too. The Fuel regulator could be an issue too, but don't buy it. buy the Tbi rebuild kit, if it is a tbi in '89(I have a '90 and it is). Anyways the kit was like $26.00 and it came with the diaphragm that the regulator needs. Hope it helps
 
  #7  
Old 01-18-2010, 04:42 PM
Beginning Member
Thread Starter
Join Date: Jan 2010
Posts: 22
blbikerood is on a distinguished road
Default I'm getting ready to

go pick it up on a trailer and bring it home. Went there earlier today. Local mechanic said it has to be the relay. Don't know. I'll let you know.
 
  #8  
Old 01-18-2010, 09:25 PM
Beginning Member
Thread Starter
Join Date: Jan 2010
Posts: 22
blbikerood is on a distinguished road
Default hey guys

i finally got the thing home. where is the fuel pump relay on these trucks. thanks.
 
  #9  
Old 01-19-2010, 06:23 AM
swartlkk's Avatar
Administrator
Join Date: May 2005
Location: Waterloo, NY
Posts: 40,803
swartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond repute
Default

It will be on the firewall. It should be the one closest to the passenger side fender if there is more than one.
 
  #10  
Old 01-19-2010, 06:09 PM
Beginning Member
Thread Starter
Join Date: Jan 2010
Posts: 22
blbikerood is on a distinguished road
Default Well it wasn't the relay

We put on a new fuel filter and a brand new relay from Oreilly's. Truck will still start and idle for about 4 seconds and that is it. No parts store has a fuel pressure gauge in our area. As long as i keep fuel in the carb it runs and sounds great. I just bought the truck and have never driven it. I hope to get it going soon. Thanks.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
tagodwin23
Full Size K5 (1969-1991) GMT415 (1992-1994) Tech
3
02-03-2013 12:39 PM
Tater
2nd Gen S-series (1995-2005) Tech
9
01-23-2012 09:52 AM
smitchelle
2nd Gen S-series (1995-2005) Tech
8
01-05-2012 11:24 PM
JetJock79
Engine & Transmission
11
12-31-2011 01:11 PM
Big Ted
2nd Gen S-series (1995-2005) Tech
11
11-08-2010 10:21 AM


Thread Tools
Search this Thread
Quick Reply: 89 K5 Blazer starts right up , idles for 3seconds and dies..


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.