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Blazer Fuel Pump Problems

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

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#79 of 100 Fuel Pump by duntov Apr 15, 2009 (5:54 pm)
The fuel pump fits 1997-2001 Chevrolet Blazer and GMC Jimmy.
#80 of 100 Re: interchange pump [franbill] by jlflemmons Apr 15, 2009 (7:16 pm)
Replying to: franbill (Apr 15, 2009 4:01 pm) Only the two door fuel pump will fit, not the four door. The different sources show conflicting information on year interchanges. Some show 99-01, others show 96-02. This may be one of those times where you will need to get the part number off the pump module. From what I can discern, the break point is -02 and later because of the fuel tank itself.
#81 of 100 Re: Fuel pressure regulator. [duntov] by billy_m09 May 01, 2009 (6:06 am)
Replying to: duntov (Sep 06, 2008 1:38 pm) thanks for ur help i hope it dont cost that much but well see maybe i'll get lucky well ok thanks again!
#82 of 100 blazer driving me crazy by fordman76 May 04, 2009 (4:58 pm)
I really wish I done my home work! I had to put ball joints on a blazer my sister bought,pain in the ass but got it done.her brake lights had quit was trying to figure that out,come to find out the hazard switch was bad replaced that.Now the damn thing wont start.The fuel pumps not priming up checked fuse,relay in engine compartment seem to be fine.so I dropped the tank straight wired the pump and it shot fuel out damn near eight foot.I do not believe Im getting power to the pump, but the sending unit is still working.Any ideas would be great,the truck has security sys. the light blinks,but when you turn the key on it goes out,so I dont think it is that Replies to this message: ixxixxi (May 04, 2009 5:31 pm)
#83 of 100 Re: blazer driving me crazy [fordman76] by ixxixxi May 04, 2009 (5:31 pm)
Replying to: fordman76 (May 04, 2009 4:58 pm) even if your fuel pump works, if it is old or worn, it will still push fuel through but not enough for the air/fuel mixture required to start the engine. I had this happen and the only thing that happened was it would just keep turning and turning but wouldnt start. Do you have a check engine light on? You should be able to rent a computer from your local auto parts store. Granted they arent the most sophisticated like the mechanic's, but it will get you in the ball park. If you get a code for your air/fuel mixture too lean, chances are the pump is bad. You could always start out by changing the fuel filter (under driver side on the inward side of the chassis) and if that dont work then may be the pump. I would recommend getting an OEM pump as I have went through 2 auto store pumps in a year and a half, so that would equal the cost of a factory pump anyways. Good luck
#84 of 100 really that difficult? by mandalizabeth Jun 16, 2009 (5:44 pm)
i have a 98 blazer that needs a new fuel pump, i was estimated $835. after looking around a little bit, i have found the highest priced fuel pump to be about $250, and some even under $100. granted, i know nothing about how it is replaced, over $500 for labor seems a bit much. the mechanic that gave me this estimate is a friend of my family, so no one believes that this is a ridiculous estimate, but i'm kind of weary. he says that they are extremely difficult to get to and replace. i just wanted to find out exactly how difficult it is and if $835 is reasonable? i absolutely love my blazer, but if this is honestly the cheapest i can get it done for, im gonna have to get rid of it. =\ help. Replies to this message: ixxixxi (Jun 16, 2009 6:10 pm)
#85 of 100 Re: really that difficult? [mandalizabeth] by ixxixxi Jun 16, 2009 (6:10 pm)
Replying to: mandalizabeth (Jun 16, 2009 5:44 pm) Search the pages in this article as I posted a detailed walkthrough on how to change a fuel pump out yourself. It only takes a couple hours with the right tools. You can buy the cheaper pump but remember...you get what you pay for. If you can afford it get the original factory one from chevy dealer for $400-$450. A mechanic can do a complete change in an hour but they have a set time in a book that it should take to change it. So if they charge $400 for labor to change a pump you pay that price even if it takes 15 minutes. But its really easy to do but if you can't do it, ask a local mechanic because you could save up to $50 an hour labor.
#86 of 100 fuel pump by duntov Jun 17, 2009 (5:04 am)
The fuel pump is located inside the gas tank. The gas tank must be emptied, removed and cleaned before replacing the fuel pump. The fuel pump assembly, fuel pump wiring harness and screen should be replaced. Some fuel pumps include the wiring harness but the screen must be purchased separately. It is recommended that the in-line fuel filter be replaced every 10,000 miles because if it is restricted it can place an unecessary strain on the fuel pump which will lead to a early failure. I don't know iof this helps but I always keep at least 1/4 tank of gas to keep the fuel pump submerged in fuel. The rumor is that a fuel tank that is nearly empty all the time can overheat and damage a fuel pump. Some examples of the more expensive brand of parts that are needed for 1998 Blazer 18 gallon tank with a low lubricity fuel tank sender (module) and pump (RPO K55): AC Delco fuel pump and sender, MU112 (GM-25878731) ...$343 AC Delco Strainer, TS102 (GM-25179682).........$36 Airtex harness WH3006...........$10 Your application may vary.   It is a job that I would not want to do and I have heard from others who have replaced the fuel pump themselves and they said they would not want to do it again. For a person that is unfamiliar with the job, it will take at least 4 to 6 hours.
#87 of 100 98 Blazer Fuel Pump by pinetopfirefig Jun 28, 2009 (6:53 am)
Alright, I just had a 3rd fuel pump put in my 98 Blazer. Last one lasted 7 months, and at that time I had the underhood fuseblock replaced as well. 2 weeks ago I had intermittent starting, and then got it to the shop and they replaced the fuel pump which had gone out (under warranty-ac delco). Anyway, got the blazer home and the next day, it would not start. I can not hear the very distinct sound of the pump coming on, so I am assuming there is a short somewhere. The pigtail was replaced, relay replaced, filter replaced, all the usual stuff checked. My mechanic is stumped. I am wondering if it is the ignition, spider, or computer. I have no security system to mess things up, so thats out. Any ideas? Replies to this message: nicsand (Jun 28, 2009 9:41 am) jlflemmons (Jul 12, 2009 6:43 pm)
#88 of 100 Re: 98 Blazer Fuel Pump [pinetopfirefig] by nicsand Jun 28, 2009 (9:41 am)
Replying to: pinetopfirefig (Jun 28, 2009 6:53 am) I do have a couple of ideas. I have a 97 chevy blazer with some of the same problems you've had. From my experience the buzzing noise that I heard was the fuel pump. When I had it replaced the mechanic said the fuel pump wasn't placed properly and thats where the buzzing noise came from. He said you shouldn't here the pump coming on. As far as the intermittent starting try to check the ignition module. I had mine replaced almost a year ago and I haven't had any problems since. Hope this helps. Replies to this message: jlflemmons (Jul 12, 2009 6:43 pm)

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