Wont Start

dannymoz71 · 10-25-2008, 05:00 PM

I have a 96 Blazer with the 4.3L, Auto, and 4X4. It is really hard to start and runs kinda crappy when it does. Hooked up a fuel pressure tester today. With the key on it goes up to 55-60 PSI until the pump shuts off, then it goes straight to 0. Cranking it has 60 PSI and running it has 54 PSI. I think the pump is getting kind of weak, but it also seems like the regulator might be shot. Any ideas?

shaynel18 · 10-25-2008, 05:15 PM

idk but mine does sum weird stuff like dat, sum time it will start up fine then afta da fuel pump turnes off itwill idel really ahrd then just die, then when i go to restart it it takes a few secs it wont come right back on, so if u fig it out let me kno so i can fix it on mine to

Yogi · 10-26-2008, 12:02 PM

Quote: Originally Posted by dannymoz71

I have a 96 Blazer with the 4.3L, Auto, and 4X4. It is really hard to start and runs kinda crappy when it does. Hooked up a fuel pressure tester today. With the key on it goes up to 55-60 PSI until the pump shuts off, then it goes straight to 0. Cranking it has 60 PSI and running it has 54 PSI. I think the pump is getting kind of weak, but it also seems like the regulator might be shot. Any ideas?

With key on, you need 58# min to start, so 55 could be a problem but I would expect it to start. Also not good that the pressure drops when you turn the key off.

How long has it been since you changed plugs, wires, cap & rotor?

dannymoz71 · 10-26-2008, 08:31 PM

Dont know when they were last changed. I just got this about a month ago. Didnt run when I got it. So far all Ive done is replace the alternator, It was shot, and test the fuel pressure.

Yogi · 10-26-2008, 09:59 PM

It's best to start with the basics. Replace the plugs, wires, cap & rotor and see how it runs then.

Kaznlilgreenmen · 10-27-2008, 09:29 AM

Quote: Originally Posted by shaynel18

idk but mine does sum weird stuff like dat, sum time it will start up fine then afta da fuel pump turnes off itwill idel really ahrd then just die, then when i go to restart it it takes a few secs it wont come right back on, so if u fig it out let me kno so i can fix it on mine to

You pretty much answered your own question

Sounds like a fuel pump issue...could be wrong tho... Like yogi said start small....plugs/wires/cap rotor/ even a fuel filter.

shaynel18 · 10-27-2008, 03:29 PM

my fuel pump is brand new tho i hope its not that, i wnna do my wires and stuff this weekend, but i wanna up grade it all, what size should i get?

10-25-2008, 05:00 PM	#1
dannymoz71 Registered User Age: 32 Join Date: Aug 2008 Posts: 9 Location: User is: OffLine	Wont Start I have a 96 Blazer with the 4.3L, Auto, and 4X4. It is really hard to start and runs kinda crappy when it does. Hooked up a fuel pressure tester today. With the key on it goes up to 55-60 PSI until the pump shuts off, then it goes straight to 0. Cranking it has 60 PSI and running it has 54 PSI. I think the pump is getting kind of weak, but it also seems like the regulator might be shot. Any ideas?
	[Reply w/Quote]

10-25-2008, 05:15 PM	#2
shaynel18 Registered User Age: 22 Join Date: Oct 2008 Posts: 218 Location: User is: OffLine	Re: Wont Start idk but mine does sum weird stuff like dat, sum time it will start up fine then afta da fuel pump turnes off itwill idel really ahrd then just die, then when i go to restart it it takes a few secs it wont come right back on, so if u fig it out let me kno so i can fix it on mine to
	[Reply w/Quote]

10-26-2008, 12:02 PM	#3
Yogi Registered (Ab) User Join Date: Feb 2008 Posts: 4,093 Location: League City, TX (Houston) User is: OffLine	Re: Wont Start Quote: Originally Posted by dannymoz71 I have a 96 Blazer with the 4.3L, Auto, and 4X4. It is really hard to start and runs kinda crappy when it does. Hooked up a fuel pressure tester today. With the key on it goes up to 55-60 PSI until the pump shuts off, then it goes straight to 0. Cranking it has 60 PSI and running it has 54 PSI. I think the pump is getting kind of weak, but it also seems like the regulator might be shot. Any ideas? With key on, you need 58# min to start, so 55 could be a problem but I would expect it to start. Also not good that the pressure drops when you turn the key off. How long has it been since you changed plugs, wires, cap & rotor?
	[Reply w/Quote]

10-26-2008, 08:31 PM	#4
dannymoz71 Registered User Age: 32 Join Date: Aug 2008 Posts: 9 Location: User is: OffLine	Re: Wont Start Dont know when they were last changed. I just got this about a month ago. Didnt run when I got it. So far all Ive done is replace the alternator, It was shot, and test the fuel pressure.
	[Reply w/Quote]

10-26-2008, 09:59 PM	#5
Yogi Registered (Ab) User Join Date: Feb 2008 Posts: 4,093 Location: League City, TX (Houston) User is: OffLine	Re: Wont Start It's best to start with the basics. Replace the plugs, wires, cap & rotor and see how it runs then.
	[Reply w/Quote]

10-27-2008, 09:29 AM	#6
Kaznlilgreenmen I piss excellence Age: 25 Join Date: Oct 2004 Posts: 850 Location: Springville Ny User is: OffLine	Re: Wont Start Quote: Originally Posted by shaynel18 idk but mine does sum weird stuff like dat, sum time it will start up fine then afta da fuel pump turnes off itwill idel really ahrd then just die, then when i go to restart it it takes a few secs it wont come right back on, so if u fig it out let me kno so i can fix it on mine to You pretty much answered your own question Sounds like a fuel pump issue...could be wrong tho... Like yogi said start small....plugs/wires/cap rotor/ even a fuel filter.
	[Reply w/Quote]

10-27-2008, 03:29 PM	#7
shaynel18 Registered User Age: 22 Join Date: Oct 2008 Posts: 218 Location: User is: OffLine	Re: Wont Start my fuel pump is brand new tho i hope its not that, i wnna do my wires and stuff this weekend, but i wanna up grade it all, what size should i get?
	[Reply w/Quote]