Ask the Car People.SM


Chevy Blazer Fuel Pump and Pressure Regulator Problems

208 messages,  Last post on Feb 20, 2013 at 1:03 PM

You are in the Chevrolet Blazer Forum.

What is this discussion about? Chevrolet Blazer, SUV

Messages Page 21 of 22

#194 of 208 Re: 2000 chevy blazer fuel pressure switch [racer4x4] by freakist

Sep 29, 2011 (7:40 am)

Replying to: racer4x4 (Sep 27, 2011 8:23 am)
Having a failing fuel pump is likely the cause of this, The pump is required to send fuel at around 58-62 psi (on mine) and when the engine isn't running, the battery must supply power to pump up this pressure, a worn set of bearings or anything else that causes the pump to be slightly harder than normal to turn will require more voltage than the battery can deliver at startup, especially since the battery must also send current to the voracious starter simultaneously, so the pressure from the pump doesnt get high enough to allow the system to effectively inject the fuel into the cylinders. u add gas, it fires it up, the alternator starts providing power at a higher voltage, the starter is turned off, shazzam, the pump is getting enough juice to work. A fresh battery may help for a little while,or even just jump starting), new pump is long term solution. A leaky fuel pressure regulator would likely not cause this issue, but will definitely ruin your mpg.

#196 of 208 Fule Pressure Regulator by mtngoat69

Oct 29, 2011 (2:28 pm)

My 2000 Blazer has been not strating with out starting fluid for a few months (working long hours - no time to repair) and now it will not start. Will run if gas is soprayed into it. Fule pump runs - have nto check pressure but from all I see it seems to be the fuel pressure regultor.
 
First am I right in my diagnosis and second - what is entalied in replacement. I find no clear instruction.
 
Thanks!

#197 of 208 Re: 2000 Chevy Blazer won't start / low fuel pressure [cramcam] by mperu99

Oct 29, 2011 (8:34 pm)

Replying to: cramcam (Jul 31, 2010 5:54 pm)
Did you ever figure this out???
 
seem like the exactly problem i am having, once i get it started, it will restart with in a few minutes i let it set for over an hour.. no dice..
 
was it the fuel pump?

#198 of 208 Re: 2000 Chevy Blazer won't start / low fuel pressure [cramcam] by mperu99

Oct 29, 2011 (8:43 pm)

Replying to: cramcam (Jul 31, 2010 5:54 pm)
Did you ever figure this out? sounds exactly like my issue

#199 of 208 2000 blazer wont start by bigdaddy71

Nov 15, 2011 (10:05 am)

blazer wont start and fuel pump doesn't prime, is there anything that can stop this besides bad fuel pump or relay?

#200 of 208 Re: 2000 Chevy Blazer won't start / low fuel pressure [mperu99] by mperu99

Nov 15, 2011 (5:30 pm)

Replying to: mperu99 (Oct 29, 2011 8:43 pm)
FIXED!! - I originally put a pressure gauge and it was reading 48lbs, i thought that was enough, however it was not.. I replaced the pump and the fuel filter and now i got 60 lbs (key on - not started) 54 lbs (running) Now it starts no issues.
 
You should be near 61 lbs (key on - not started) for proper starting. 55 - 61 lbs for starting, the higher the better.
 
A plugged fuel filter will cause the fuel pump to work harder and eventual damage it. Cheap and reasonable replaceable part.
 
A fuel pressure tester is a easy way to figure out if your pump is working when key is turned on., I noticed the new pump has a new wiring design. They changed the way it connects because the connection were failing either shorting out or ground would break. So its a good idea to change it out if you have over 150,000 miles on it anyhow.

#201 of 208 Re: 2000 blazer wont start [bigdaddy71] by mperu99

Nov 15, 2011 (5:32 pm)

Replying to: bigdaddy71 (Nov 15, 2011 10:05 am)
the wiring can be big issue, no grounding
 
or shorting in the connection...

#202 of 208 Re: 2000 Chevy Blazer won't start / low fuel pressure [mperu99] by freakist

Nov 15, 2011 (7:55 pm)

Replying to: mperu99 (Nov 15, 2011 5:30 pm)
I had a circumstance once wherein I had a short inside the oil pressure sender, and this kept blowing the fuse on the ecm "b" bus, which killed the fuel pump relay. whatever you do, don't try putting in larger fuses to get it to run longer if you find the ecm fuses keep blowing. it may require pulling each sensor and bench testing it, but too many amps through the ecm sensor feed circuits will roast the ecm board, or set fire to wiring. newer vehicles with extra sensor stuff in the tank could be in severe danger if you attempt to put in a larger fuse when a circumstance like mine comes up. Luckily somebody got wise and stopped making the metal bodied senders, probably just because of the potential of underhood fires. careful work is in order when dealing with fuel tanks and lines, just sayin! Good skill to you!

#203 of 208 Re: 2000 blazer wont start [mperu99] by bigdaddy71

Dec 09, 2011 (3:22 pm)

Replying to: mperu99 (Nov 15, 2011 5:32 pm)
after about 2 or 3 days it will start and run for about 5 minutes but then it cuts off and wont start again for 2 or 3 days, help?

Messages Page 21 of 22

To POST a message, please Sign In.

Advertisement

Browse by Category

Browse by Vehicle
   View All Vehicles

Browse by Board
Browse by Topic
View All Topics

Edmunds Community

Advertisement