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Chevy Blazer Fuel Pump and Pressure Regulator Problems

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

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Messages Page 18 of 21

#170 of 208 2000 Chevy Blazer won't start / low fuel pressure by cramcam

Jul 31, 2010 (5:54 pm)

I have a 2000 blazer with 4.3l CSEFI engine that won't start. I can get it started with starting fluid, and it will run after that but it hesitates from time to time, nearly stalling.
 
After I shut it off, it will restart if I try within 10 minutes. After that, it won't restart without using the starting fluid.
 
I hooked up a fuel pressure gauge. When I turn the key and the engine is cold, it reads around 48-50 PSI. At this point it won't start. When I start it with the fluid and it's running, the pressure goes up to around 55 psi. When I shut it off and turn the key back on the pressure reads around 58psi. But if I leave it off for about 10 minutes that pressure drops back down to below 50 PSI again and it won't start again.
 
Is this problem my fuel pump? I have already replaced my fuel filter.
 
Any suggestions?

#171 of 208 It's got to be fuel related by blazersg

Sep 14, 2010 (2:45 pm)

My blazer won't start when it sits for over 6 hours. Hooked a pressure gauge up and it is 54 psi key on, running 56, and after 30 min it drops to 50. I have replaced filter and no leaks visible. Any help would be grateful.

#172 of 208 Re: It's got to be fuel related [blazersg] by gfd749

Sep 15, 2010 (6:14 pm)

Replying to: blazersg (Sep 14, 2010 2:45 pm)
have u check your fuel pump or fuel pressure regulator. if im no mistaken the 4.3 fuel system should be at or above 60 psi. im looking at the same problem on my 97 chevy c1500. im about to change my pressure regulator since i just replaced my fuel pump 2 years ago and the regulator is a hell of a lot cheaper. i'll try to let u know how it turns out.

#173 of 208 2001 chevy blazer by galanin

Oct 04, 2010 (7:51 pm)

i have a 2001 chevy blazer 4wd 2 dr changed fuel pump,fuel filter,cap and rotor sparkplugs . truck wont run have to pour gas to get it to run ,but this only last's for a few secs and we dont hear fuel pump prime like as before . any ideas

#174 of 208 really fuel confused by offstar

Dec 02, 2010 (8:32 am)

I have read all the posts and am still confused where my next step is. my 2000 4door blazer (TBI) would not start after an extended idling period,everything pointed to the fuel pump. I replaced the pump and after prime it started. I drove it to get gas and to the car wash and then home, started every time. it sat two days and now it will not start again! I hear the pump running but to me that means nothing after all of my reading. I did replace the harness when i replaced the pump as well as the the fuel tank pressure sensor. this blazer only has 60k and fuel is gettting to the Throttle body.
ANY IDEAS?? Can i add a secondary pump to bypass the factory setup to rule out the pump all together?
All ideas welcome and appreciated.

#175 of 208 Re: really fuel confused [offstar] by duntov

Dec 02, 2010 (10:13 am)

Replying to: offstar (Dec 02, 2010 8:32 am)
If the engine will not start after a period of idling or after the engine gets to operating temperature, it could be a temperature related ignition control problem..
 
Replace the ICM (Ignition Control Module) and heat sink. Use new mounting screws.
 
Replace the fuel pump relay.
 
Replace the fuel line filter.
 
Always check the fuel pump pressure after a fuel pump is replaced,. If the fuel pump pressure is not to spec the engine may not start when it reaches ooperating temperature. You should always replace the fuel pump wiring harness and fuel pump screen when the fuel pump is replaced. The better fuel pump kits include a new harness and pump screen.
  
Replace the fuel pump regulator.

#176 of 208 Re: 1997 Chevy Blazer Fuel Pressure regulator replacement [lelias] by chevynutty00

Dec 19, 2010 (11:40 am)

Replying to: lelias (Jan 13, 2008 11:32 am)
if the fuel pressure regulator located outside of intake plenum it must under it next to fuel injector pack that the way it is on the 1995 blazer

#177 of 208 really fuel confused by chevynutty00

Dec 19, 2010 (11:45 am)

check fuel pressure will running shut engine off for a few minutes to half hr. to see if pressure holds up. If it doesn't could be regulator . If there is a strong smell of gas fumes could be fuel injectors

#178 of 208 Re: really fuel confused [chevynutty00] by chris10h

Apr 18, 2011 (9:01 am)

Replying to: chevynutty00 (Dec 19, 2010 11:45 am)
i had low fuel pressure in my also. changed fuel pump worked for a while. changed fuel filter and pressure regulator. still same problem.
 
In the end the fix was to drop my gas tank and rinse it out with gas. then i vacuumed up the old rust that was in the tank. put it back together and no more problems. better gas mileage and power. hope this works. gl

#179 of 208 Re: really fuel confused [chris10h] by duntov

Apr 18, 2011 (9:28 am)

Replying to: chris10h (Apr 18, 2011 9:01 am)
It is recommended you should also replace the gas tank when the fuel pump, wiring harness and screen is is replaced. A new gas tank cost $100 and it is a cheap insurance. The fuel filter should last 30,000 miles if you have a clean tank.

Messages Page 18 of 21

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