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Blazer Fuel Pump Problems

100 messages,  Last post on Oct 14, 2009 at 1:24 PM

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#91 of 100 Re: 98 Blazer Fuel Pump [nicsand] by jlflemmons Jul 12, 2009 (6:43 pm)
Replying to: nicsand (Jun 28, 2009 9:41 am) I hate to disagree with your mechanic, but every tank mounted AC Delco fuel pump makes a buzzing noise during prime. You cannot put a motor/pump (fuel pump) in a great big hollow drum (fuel tank) without getting some noise. I have been working on GM since before they started using electric fuel pumps, and the pump ALWAYS makes noise during the prime cycle. They still make noise when the car is running, but you cannot hear it over the engine. I'm not talking about a loud buzzing, but with half-way decent hearing you can tell when the pump primes.
#92 of 100 Re: fuel pump [vbspeedo] by jlflemmons Jul 12, 2009 (6:45 pm)
Replying to: vbspeedo (Jul 12, 2009 5:31 pm) Not sure what "pickup coil" he means, unless the crankshaft position sensor. This is mounted down near the harmonic balancer and detects that the crank is turning. If it fails, it will tell the ECM that the engine is not turning, and the ECM will in turn shut down the fuel pump and injectors. Replies to this message: blazzr2 (Sep 27, 2009 8:53 pm) jlflemmons (Sep 28, 2009 5:30 am)
#93 of 100 Re: fuel pump [jlflemmons] by blazzr2 Sep 27, 2009 (8:53 pm)
Replying to: jlflemmons (Jul 12, 2009 6:45 pm) Ok, had a check engine light a couple weeks ago...came back saying cam and/or crank sensor faulty, engine misfire, blah blah blah...(probably my own fault for driving w/ a flat spot on a tire--too much bouncing). It would be on for a couple days, then go away for a few more (this has been going on for a few weeks now). Now, today, pulled into the driveway (kinda gunned it to pull up the drive way--just screwin around with my truck), and it would not start again. No distinct whine from the fuel pump, no nothing. The only reason I'm posting something here instead of replacing the sensor is to see if there's a common problem with blazers.... Mine is a 2000 Zr2, and has had a bit of an issue with a quick goose of the accelerator right before shutting the vehicle down. This is the third time it has happened (and yes, I've learned my lesson about hittin the gas right before I turn it off), but this is the first time I have not heard the fuel pump engage. The fuel pump is just over a year old (and I will NOT do that job again), and previously with persistence it would be up and running again. Any ideas/feedback? Replies to this message: jlflemmons (Sep 28, 2009 5:30 am)
#94 of 100 Re: fuel pump [blazzr2] by jlflemmons Sep 28, 2009 (5:30 am)
Replying to: blazzr2 (Sep 27, 2009 8:53 pm) No laughing allowed, but kick the bottom of the fuel tank in the area where the fuel pump resides. Don't go for a 50 yard field goal here, just a good solid thump.   Then see if the fuel pump primes up.   I really cannot think of a reason why gunning it before shut down would keep it from starting. It might make it turn over a few extra turns to clear the excess fuel, if any, but the ignition should be generating more than enough spark to overcome the small amount of extra fuel left.
#95 of 100 fuel pump cpi and the crankshaft sensor by blazerowner Oct 09, 2009 (9:36 pm)
I have a 94 blazer, The fuel pump went out! Fried the wires in the tank! Replaced entire assy. pump works! Got fuel to the test port, havent checked psi as of yet! Replaced the cpi (SPIDER) still no fuel at injectors!!As long as i feed it fuel by hand it runs! The cpi is not working. What controls it! The Crankshaft sensor!! Located bottom leftside of Timing Gear cover!! Aah hah!!! MINE dont have one at least not there! The haynes book clearly shows one but not on my Blazer s-10 4.3 V-6 vortec 4x4 vin 8th w 4 door been in family since day 1 ANY IDEAS outthere i even bought the sensor just to see what it looks like Replies to this message: jlflemmons (Oct 10, 2009 2:50 pm)
#96 of 100 Re: fuel pump cpi and the crankshaft sensor [blazerowner] by jlflemmons Oct 10, 2009 (2:50 pm)
Replying to: blazerowner (Oct 09, 2009 9:36 pm) If yours is a late 93, it may not have the crank position sensor. What Haynes is showing is correct, the CPS is bolted up at the 7 o'clock position relative to the crankshaft pulley.   If your oil pressure sending unit is not registering, the fuel pump will prime, but not run. Safety feature to protect the engine in event of oil pressure loss.
#98 of 100 97 Pressure Regulator by bluejay5 Oct 13, 2009 (5:28 pm)
Have a 97 blazer with fuel pressure problems. Pressure at the fuel rail about 7lb and falls to 0 as soon as pump stops, took the line off at the output of the filter and can NOT hold the pressure back with my finger so i figure the regulator is bad. I also have a 95 that I replaced the regulator assy. about 7 months before the tranny took a powder at 180K. Since both are engine code W shouldn't I be able to use the one use the one from the 95 and put it in the 97? Just trying to save some cash in these times. TIA Replies to this message: jlflemmons (Oct 14, 2009 9:02 am)
#99 of 100 Re: 97 Pressure Regulator [bluejay5] by jlflemmons Oct 14, 2009 (9:02 am)
Replying to: bluejay5 (Oct 13, 2009 5:28 pm) Easy way to check, go to an online parts store (Autozone, Advance, O'Reilly) and look up the regulator for both year models. Chances are it will be the same part number for both.
#100 of 100 Tarry looking gas by whitemfox Oct 14, 2009 (1:24 pm)
I have a 96 Blazer w/v6 vortez, I have been having trouble with it starting, I need to prime it to get to start then it seem to run ok although it reves a littel high when drving. but because of that I have changed the fuel filter several times because when I take it off the gasoline looks blackish and tarry looking and I cannot figure out why any suggestions The fuel pump pressure is a little of 50 psi

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