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Old November 16th, 2009, 05:11 PM   #1
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Default 96 suburban fuel pressure/pump issue?

96 burban 350 motor.

went outside this morning. cranked multiple different times would not fire.
not even a sputter.

shot it with starting fluid and it fired right up for 10 seconds then died. figured pump went out. so i pushed it into garage tonight and now its starting for 10 seconds on its own revving up then starting to sputter. then revving up then sputtering and stalling again.

so my question is what actually is a part of the fuel system on this truck. is there a pressure regulator? i already changed the filter last month when i was getting some stalling issues and found a broken ground strap which seemed to be my problem at the time.

I dont want to pull the tank and pump unless i know thats the problem.

anyone around pinckney have a fuel pressure tester I can use tomorrow?
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Old November 16th, 2009, 05:20 PM   #2
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take a peak at your cap and rotor ... had an issue like that on my old 96...that's what it was
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Old November 16th, 2009, 05:32 PM   #3
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i had intermintent stahling issue about a month ago. I changed plugs, cap, rotor and wires. didnt fix it. then found a broken ground strap and it went away.
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Old November 16th, 2009, 05:42 PM   #4
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Autozone has a fuel pressure test kit in their loan a tool program.
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Old November 16th, 2009, 05:55 PM   #5
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there is a fuel pressure regulator on that truck. some times the check ball will faily and let the fuel pressure bleed off. i had the same problem on a 2000 i had back in the day.
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Old November 16th, 2009, 08:06 PM   #6
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rented pressure guage. its showing when i turn key on and when it runs for 10 seconds before it stalls out

PSI 55-62
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Old November 16th, 2009, 10:24 PM   #7
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With ignition "ON," engine "OFF" and fuel pump running, pressure should be 385-430 kPa (56-62 psi).
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Old November 16th, 2009, 10:27 PM   #8
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Or hit the gas tank right under the fuel pump with a while somebody is cranking it.
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Old November 17th, 2009, 01:58 AM   #9
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Quote:
Originally Posted by chevotass View Post
rented pressure guage. its showing when i turn key on and when it runs for 10 seconds before it stalls out

PSI 55-62
I do believe pressure should be between 60-66 psi...FWIW My wifes pump on her 4.3 went bad (Same FI system) hers was showing about the same 55psi at idle but as soon as I gave it gas it would die, few starts later and it would not start at all. New fuel pump shows 65psi with key on and 61 when running at idle...runs perfect now! 99% sure yours is bad without even looking at it! Very common problem on Chevy trucks in the mid 90's early 2,000's! PS: Another common problem is the connector so if you get a new pump make sure it comes with a new connector and use it. Solder it and use shrink tube, don't rush it with butt connectors and duct tape

Last edited by Disturban; November 17th, 2009 at 02:11 AM.
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Old November 17th, 2009, 04:03 PM   #10
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went out today. and realized it was stalling after firing because i had the intake off with the masflo sensor. put it back on and its purring like a kitten. been running for 30 minutes at consistent 55-60 psi.

so... leaky injectors??
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Old November 17th, 2009, 08:44 PM   #11
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leaky injectors??
put the pressure guage back on, cycle the key to build pressure, then leave the key off and guage attached...with a good system it should not drop more then a couple psi after about 5 minutes...if the pressure is leaking off faster then that, then start looking for an internal leak
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Old November 18th, 2009, 12:54 PM   #12
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sounds like the pump

how many miles on it?
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Old November 18th, 2009, 01:42 PM   #13
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200k. on truck. no idea if its ever been changed. have only had it for a year.

I put guage on it. turned on ignition. went to 55psi. turned off ignition. let it sit 5 minutes and it went down to 45psi. after 15 minutes it was at 40psi. and after 30 min it was at 35psi.
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Old November 18th, 2009, 01:49 PM   #14
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nothing to do with this thread just fuel related

yay i had the joy of changing my 165,000 mile fuel filter in my 95 tahoe today


it had a slow loss of power for the past 6 months( i figured it was the converter or fuel pump) i procrastinated until it wouldnt pull out into traffic safely or hit highway speeds.
all good now!
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Old November 18th, 2009, 01:55 PM   #15
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Quote:
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200k. on truck. no idea if its ever been changed. have only had it for a year.

I put guage on it. turned on ignition. went to 55psi. turned off ignition. let it sit 5 minutes and it went down to 45psi. after 15 minutes it was at 40psi. and after 30 min it was at 35psi.
Sounds like its leaking ''back.''
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Old November 18th, 2009, 09:30 PM   #16
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pinch off the return line and try it again...if it holds pressure then, the regulator is the problem...if it still leaks, the problem is either a leaking injector or the pump.

to check for a leaking injector, unbolt and lift up the fual rail with the injectors still installed in the rail..make sure anything removed is reinstalled, and then pressurize the system again and watch for any drips coming from the injectors...if you are having a hard time seeing the injectors drip, put a paper towel directly under the injectors and watch that



have you checked the flow rate of the pump yet? not sure what the spec is, but shouldnt be too hard to find...you can have pressure without having enough flow, and it will appear to bleed down slightly...I would suggest checking that first.
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Old November 19th, 2009, 12:58 PM   #17
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im going to work on it again hopefully tonight when i get some time. but driving it around today the only issues im having are at low throttle driving. if im giving it 1/4 throttle to keep at 45mph it has a slight chugging feeling. if i give it just a touch more gas it goes smooth again. i can stand on the throttle and its got all the power in the world. it only chugs when its given very little throttle.
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Old November 19th, 2009, 11:26 PM   #18
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so the problem is only at low idle, or just off idle, and when starting? and you just did a basic tune up, correct? the air filter is not clogged is it? what type of fuel system is this, and more specifically, what type of idle air control system does it have?
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Old November 21st, 2009, 09:30 PM   #19
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is there a way to test the TPS units? it drove fine from ann arbor to flint today then all of a sudden cruisin 45mph the engine just seemed to die. 5 seconds later it took right back off. wondering now if that TPS sensor is acting up.
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Old November 21st, 2009, 09:58 PM   #20
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change fuel filter yet?
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