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03-23-2005, 10:00 AM | #1 | |
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1996 S10 Blazer Low fuel pressure ????
Hello all I followed the thread
http://www.automotiveforums.com/vbulletin/t377176.html to gauge where my truck stacked against his problem and did some testing. Here are the issues I'm dealing with. ~Long cranking to get the truck to start. sometimes 3-5 minutes of on/off cranking ~once started - accelerating just sucks! seems that the truck can't get out of its own way. it does downshift but seems to take forever to reach a rpm in which it will shift again. ~limited funds just rebuilt the rear differential (the whole thing) ~ No engine codes ~ all new O2 sensors Fuel system pressures Fuel Pressure @KOEO 52 PSI @KOER 50-52 PSI @KO 58 PSI @KO 5 minutes 50 PSI (intially jumps to 60 PSI right after you turn the truck off then bleeds down to the above PSI) Battery Voltage @KO 12.5 Vlts @KOER 14.7 Vlts LEGEND KOEO- Key On Engine Off KOER – Key On Engine Running KO – Key Out KO 5 minutes- Key Out sitting for 5 minutes Vehicle specs ~ 4.3 w engine ~ 124,600 miles ~ replaced intake gaskets upper & lower 1.5 years ago ~ oil change on regular interval ~ no towing ~ new battery 6 months old |
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03-23-2005, 10:02 AM | #2 | |
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Re: 1996 S10 Blazer Low fuel pressure ????
Fuel pressure should be @KOEO 60-66psi
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03-23-2005, 10:03 AM | #3 | |
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Re: 1996 S10 Blazer Low fuel pressure ????
Ok it should be @ 60 - 66 PSI what would cause this to be low?
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03-23-2005, 11:19 AM | #4 | ||
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Re: Re: 1996 S10 Blazer Low fuel pressure ????
Quote:
-Improper battery voltage -plugged fuel filter -bad fuel pressure regulator.
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03-23-2005, 12:12 PM | #5 | ||
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Re: Re: Re: 1996 S10 Blazer Low fuel pressure ????
Quote:
I'll most likly replace the pump & regulator in the next day or so, I'll reply whether this solves the problem
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03-23-2005, 12:57 PM | #6 | |
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Re: 1996 S10 Blazer Low fuel pressure ????
Seems like 96 and 97 were really bad years for fuel pumps and level sensors. Have to buy the whole assembly too, serious money there. Bad news.
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03-23-2005, 01:21 PM | #7 | ||
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Re: Re: 1996 S10 Blazer Low fuel pressure ????
Quote:
Lucky for '96 owners, it's not the same pump assembly/fuel level sensor as the '97s. The pump is about $240.00, much cheaper than what I paid for my '97 ($358.00 for the 2dr model, $328.00 for the 4dr model- Carter pump from NAPA). |
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03-23-2005, 03:53 PM | #8 | ||
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Re: Re: Re: Re: 1996 S10 Blazer Low fuel pressure ????
Quote:
Should be 12.8-13.8 volts with the engine off and over 14.4 volts with the engine running. Use a voltmeter , NOT the dash gauge.
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03-23-2005, 04:02 PM | #9 | ||
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Re: Re: Re: Re: 1996 S10 Blazer Low fuel pressure ????
Quote:
Your Fuel pump is able to do 60 PSI, probably not the electric motor in the pump assembly itself. It does make the 60 PSI! You probably have a leaky Fuel Pressure Pulsator, or the float valve in the sending unit needs cleaning and is leaking. If you're short of cash, and don't mind spending the 4 hours to pull the fuel tank out, you could try that. I would hunt around google to learn as much as you can. I ended up opting for a $125.00 used fuel pump that seemed to fix my problem. Meanwhile, the old pump is in the garage waiting for me to go check it out. Regards, ---- Robb ----- |
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03-23-2005, 04:08 PM | #10 | |
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Re: 1996 S10 Blazer Low fuel pressure ????
He should also test to see how long it takes for the pressure to bleed off, if I interpret his post right, it says the pressure dropped 8psi in about 5 min. A leak in the system would cause him to have low pressure. A leak is not limited to the regulator. It can be one of the following as well:
leaking fuel injectors damaged injector o-rings damaged or split fuel pulsator leaking check valve leaking fuel lines |
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03-24-2005, 09:42 AM | #11 | |
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Re: 1996 S10 Blazer Low fuel pressure ????
I'm having the exact same problem on my 1996 s10 blazer. I replaced the fuel pump and fuel filter 2 weeks ago and it felt a lot better for a while but now its starting to do the same thing. What would be the next course of action? replace the fuel pressure regulator? I'm gunna have the pressure checked tomorrow so we'll see if that pump is supplying that 60psi. I'm considering pumping a couple of .357 slugs into the engine, at least that will give me some piece of mind. This thing has given me nothing but trouble from the beginning.
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03-24-2005, 11:13 AM | #12 | |
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Re: 1996 S10 Blazer Low fuel pressure ????
did you replace the fuel filter when you put the new pump in?
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03-24-2005, 06:39 PM | #13 | |
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Re: 1996 S10 Blazer Low fuel pressure ????
Yeah I replaced the fuel filter. I've talked to a few mechanics that have told me to never put an aftermarket fuel pump in your car. I just couldn't seem to fork out the extra $150 for the OEM pump.
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03-25-2005, 11:11 PM | #14 | ||
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Re: Re: Re: Re: Re: 1996 S10 Blazer Low fuel pressure ????
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04-29-2005, 09:29 PM | #15 | |
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Re: 1996 S10 Blazer Low fuel pressure ????
tirrem.........did you get the pump looked at....
have you got the problem fixed? iv a similar situation........could you let me know |
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