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Username Post: 4.3 vortec cold start problem        (Topic#245319)
Forum Newbie
Posts: 2

Age: 57
Loc: Kitts Hill, Ohio
Reg: 07-09-10
07-09-10 07:35 PM - Post#1943144    

99 chevy blazer with.4.3 vortec wont cold start - but will start after spraying starting fluid down air intake ,what is wrong. I used to repair cars & trucks during the carburator & choke days but I don't know fuel injection

~ Chuck ~

Forum Newbie
Posts: 85

Reg: 07-16-09
07-10-10 01:56 PM - Post#1943422    
    In response to chuck69ryan

Check fuel pump pressure when you first turn the key on.

Senior Chevytalk Moderator
Posts: 24297
Loc: Austin, TX 78748
Reg: 05-09-00
07-11-10 06:17 PM - Post#1943950    
    In response to Zuhar

Welcome to the site. Did you check the fuel pressure? An engine can run on low fuel pressure however it may not start. Follow the fuel lines from the intake. You'll find a test port on the large supply line.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles

Forum Newbie
Posts: 2

Age: 57
Loc: Kitts Hill, Ohio
Reg: 07-09-10
07-12-10 02:10 PM - Post#1944321    
    In response to gchemist


~ Chuck ~

Forum Newbie
Posts: 60

Age: 52
Loc: SE MN
Reg: 11-12-08
07-15-10 01:00 PM - Post#1945757    
    In response to chuck69ryan

I just had the problem with my 02 Blazer 4dr 4wd.

Checked the fuel pressure (was low but not super low), checked fuel pump relay, started / ran with starting fluid.

All signs pointed to it being the fuel pump being bad. Though, after dropping tank and inserting two new fuel pumps (both exhibiting the same issue), it was determined that the ground to the fuel pump was bad somewhere (other than at the connection on the fuel pump).

But still, go through the checks and whatnot before doing that.

I ended up getting a different ground in the back of the vehicle and ran a wire to the pump. Fired up just fine. Ended up putting one of the new fuel pumps in just because I had it too, for good measure.

It's been NO problem since!

I'd definitely run through the check list of possibilities though (relays etc) to make sure before dropping tank. I bought the fuel pump for about 250.00 online (AC Delco for 230 total delivered, I think it was). BTW, I'm a novice at repairing the truck and I had the tank down, drained, cleaned out, new pump installed, tested, and remounted in about 3.5 hrs. The most difficult part was the brackets on the ready to pull out some of those 4 letter words when getting them reconnected...they hang loosely and you have to stretch in some odd positions to make it work!

I worked in my pit, so I'm guessing that made it a bit easier than having to crawl under it.

Hope it helps.

Current Victim:
2002 Blazer 4dr 4WD

Past Patients:
1957 BelAir Hardtop - 2dr
1957 BelAir Sedan - 2dr
1988 Blazer 2dr

Edited by CaptnTony on 07-15-10 01:05 PM. Reason for edit: No reason given.

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