Hello, I recently purchased a used Blazer, a 2000. During the test drive, everything worked fine, it started right up, everything. I drove it home, used it that day, etc. The guy I bought it from said the gas gauge "wiggled" a little at around a quarter of a tank (I know now this is a very big understatement). The next morning, I went to register it and the Blazer wouldn't start. My boyfriend jumped it and it started right up. It was fine for a few days, except that when the gas reached about a quarter of a tank, I saw what he meant. The thing is wacko! the needle flies all over the place, and its very aggrivating. Unless my tank is over half full, I have no clue how much gas I have until the light comes on. After a few days, the thing died again. But I hit the button on my key to pop the trunk which left the door open, and jumped it again, just thinking, okay the battery is probably just getting old and I need to stop sitting on my keys. Since then, it has died a few times and needed to be jumpd. Yesterday, it died after I shut if off and listened to the radio while my boyfriend was in the store for about five minutes. It did not start again, and I had to have it towed home, even after he brought his own car and tried to jump it. We've tried to jump it a few times since then and nothing. He and a friend after examining the best they can without proffesional tools or diagnostics, agree it must be the fuel pump. My questions are, would this have anything to do with the battery dyin, or is that just an unfortunate side problem. Also, where exactly is the fuel pump located and how difficult is it to replace? And also, would this be related to the gas guage acting so crazy, and is there ANY other things we should check first, before comitting to this? I have neither the time nor the money to have this thing in the shop, and quite frankly, am a little pissed that I just got the damn thing and its already dead. Please, if anyone can give me any ideas, that would be great.

 

Fuel pump is inside the tank.The pump and level sensor are all one piece.It's a DIY job,if you are handy.Use AC Delco parts.The battery issue probably isn't directly related to the pump,but there is only so much cranking power available.Your Blazer should start right up with minimal cranking.

 

this will give ya an idea what ya havr to go thro..make sure ya get right fuel pump since 2 doors and 4 doors are different..

 

Best to check fuel pressure and leakdown first, rather than just replacing the pump, (It's a rather expensive repair). Key ON, engine OFF, fuel pump running: Pressure must be 60psi to 66psi and must remain above 55psi for at least 10 minutes after the pump shuts off. If it fails either part of the test, it means there is a problem with the fuel delivery system and further testing is necessary to pinpoint the problem. Most auto parts stores rent/sell/loan fuel pressure testers. The test takes ~15 minutes. If it does end up needing a fuel pump, as mentioned above, use AC Delco ONLY!

 

@Captain Hook

I drive an S10 1997 and i will also check my fuel pump pressure. Can you please tell me where i can hook up my measurement Tester for the pressure. My Car garage they not so family with this cars and for me it will make it easier to explain them what where I can check the pressure.

Thank you so much to help me.

Greetings from Germany

Poertsch

 

Poertsch, If you have a 4.3L V6 engine, the service port for checking fuel pressure is located to the left side of the distributor, it might have a black plastic cap on it. The procedure and specifications are in post #4.

 

@Captain Hock Yes you are Right I have 4.3 engine you see my car in my picture. Is there an specification for this port. because we have in german metric and you in US you got inc. So can i use a simple pressure tester or you can show me a page where i can see a sample of this tool. Thanks this will help me out that much.

Greetings from Germany

Poertsch

 

Here is what it looks like: Actron Fuel Pressure Testers CP7818 - SummitRacing.com

Ignition ON, engine OFF, fuel pump activated: 413kpa to 455kpa

Pressure must remain above 379kpa for at least 10 minutes after the fuel pump is deactivated.

If it fails one or both tests, there is a problem, and further testing is required to locate the problem.

 

@Captain Hook you are the Best thank you so much I will send this link to my friend and he can get this for me in US.
Great i think i can use this for a lot of US Cars.

Greetings Poertsch

 

The pressure tester will work on many US vehicles. The specifications are not all the same though