Question about 1999 Chevrolet Suburban

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Suburban low pressure from fuel pump

I have a 96 Suburban 2500 w 454. Check engine light came on while towing camper. Truck seemed to have no power and it maxed out at 50 mph. Computer check said two oxygen sensors bad. Before I changed both we took a 1500 mile trip without the trailer and had no issues. We came home and changed both sensors and then the truck seems to run rough and lack power. I have not put the trailer on it for fear of damaging something. Took it to shop and they said the fuel pump is only putting out 20psi when when reved up, and it should be more like 50psi. I took the truck home without changing pump. My question is do fuel pumps fail this way? I thought they just quit. I have replaced the pump before and actually have the oem in my tool box. (turned out the pump wasnt bad, but a bad wire) I don't want to go through that again. Could it be something else?

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Try checking the fuel filter and then the pressure regulator on the rail. If the pressure regulator is bad it will not let the pump push enough pressure. And if the filter is clogged then it will also not let the engine get enought pressure. I have seen pumps starter going out by losing pressure. I have also seen aftermarket pumps quit after about a week unles you did not change the whole assembly.

Posted on Sep 27, 2009

Testimonial: "Thanks! I was unaware of the regulator. We did check the filter. Great info!"

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I have a 1994 k2500 suburban with very little tow power.I've done a complete tune up, replaced the fuel filter,Had the trans checked, replaced egr,cat and muffler,good fuel pressure,compression 14


Have you tried to manually downshift the trans going up hills? Sounds like the trans is not being told to downshift .

There is a test machine, (Want to say Odessey) that is attached to your truck and the truck is driven while hooked up. This machine can be asked questions by the mechanic. It has more electronics in it than the onboard computer. You would have the trailer attached to reveal realtime operating conditions.

It basically can do what a Dynamometer can do, while pulling a load. Even if it cost substantially to do this test, you would save by not buying parts you do not need.

Find a Dealer who knows about this type of machine and has one to use on your truck.

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Fuel pressure too low. looks like you have a weak fuel pump. here is the fuel pressure spec

Turn ON the ignition leaving the engine OFF, the fuel pressure should be 415-455 kPa (60-66 psi) when the pump is running

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Check to see if you have spark from the coil. Also take the fuel rail loose and turn the engine over a little to see if gas pumps out here.

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First, make sure they put oil back in the crankcase. Your motor may be seized. Next, we need to know if the fuel filter has ever been changed. If not, it's probably clogged and it will burn up the fuel pump if you continue to try to force gas into the injectors.

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I have a 1992 suburban 350 motor. truck had no power and bogged down when gas pedal applied. i changed the filter and now it wont start by itself. i spray starter fluid and it runs fine for 1/2 hour then...


first thing i would do i would check fuel pressure if you have good fuel pressure then the next thing i would unbolt the exhaust from the exhaust manafold and then try to start engine if the engine starts up and runs fine then you have clogged up exhaust converters

terry - Master tech

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I checked all of the fuseable links and they were all good. Next I decided to check all the power wires to the ECM and also the grounds from a wiring diagram because the Mil is controlled by the ecm and the bulb was good. The ecm is located behind the glove box. Bingo, the orange wire was only reading 3-5 volts at the ECM, but 12.5 volts after the fuseable link at the underhood fuse block (passenger side firewall). I ran a temp wire directly from after the fuseable link to the orange wire at the ecm and the ecm turned back on and the Mil or "check engine soon" light came on too. The truck started up and has never run smoother.

Note that at first the truck just stalled out and I could restart it right away with no error codes. Eventually the stalling became more frequent with longer reset times required. Once it threw a "code 54" and I thought it was fuel related as each time the gas stopped and I could still start the truck with gas poured into the TB. Ignition ok. My fuel pump turned on and ran if I tested it. I even checked the pressure regulator and the fuel filter to no avail.The orange wire that powers up the ecm is technically part or the fuel pump relay circuit as it also feeds the fuel pump relay 12.5 volts all the time. The thin orange wire from the fuse block is joined to two other thin orange wires in the large group of wires that heads to the ecm along the firewall behind the engine. I had to dig it out of the many wires to find it and remove a lot of tape. It is amazing to me that this one little orange wire could cause so much grief and be so hard to track down. I could not have afforded to take this problem to the Dealer.

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1 Answer

96 chevy 1500 suburban wont start


check the catalytic converter i had the same problem with my suburban and mine was a clogged converter.

Jan 19, 2009 | 1996 GMC Suburban

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