96 k1500 running out of fuel bad pump or no fire??? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-04-2011, 10:03 PM
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96 k1500 running out of fuel bad pump or no fire???

i need some help cause i am stumped... i have a 96 chevy 305 extended cab with alot of miles... about 6 years ago it ran simply Divine... till i was heading up the interstate one day on the way to a tractor pull and i lost every bit of power the truck had... i had the thing floored and could only muster up 35mph with a miss and a shudder and all kinds of racket... so i nursed it back to the garage and thought maybe i burnt a cap which they're noted for... well it got it back running but it still has a bad miss to this day... it has now developed a stumble driving down the road as if it is running out of fuel and then it picks back up again... also sometimes if i leave a stop sign in a hurry with the pedal on the floor it will go good but half way through first it will shut down and pick back up again within a split second like no fire or fuel... i have a p0300 misfire code now... i have replaced caps, rotors, wires, coils, modules, tps sensors, egr valves, injectors (mfi conversion), fuel filter, i replaced all the spark components and all the fuel componets except the fuel pump cause it carries 52-56 psi checked on the schrader valve in the garage... i cant do a road test cause my hose on my guage is too short to get out of the hood to the windshield... does anyone know if a long hose fuel pressure guage and where to buy it... also is it possible for a electric fuel pump to carry the proper fuel pressure but not enough fuel volume and could that be the problem? any ideas would be appreciated!!! and i can provide more info if needed...

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Old 08-04-2011, 10:31 PM
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Check for bent or stuck valves, wiped cam lobes, bent pushrods, loose rockers. Do a compression test too.
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Old 08-04-2011, 10:33 PM
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www.fullsizechevy.com go here ask you question in the tech trouble shooting section!
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Old 08-05-2011, 12:22 AM
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ah the legendary misfire codes. my girlfriends jeep has the same problem. i looked around in the net for a couple hours and it seems that the cam n crank sensors go bad very easily. forty five dollars for the pair. all that misfire nonsense started after her radiator blew up and puked antifreeze everywhere. buuuutttt i read that it COULD also be something else, but with my luck my internet crapped out as soon as i clicked on the link. ***!!

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Old 08-05-2011, 02:00 AM
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dagwood

had simular trouble with a toyota truck i knocked all the stuff out of the catalistic converter and problem stop for me
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Old 08-05-2011, 02:13 AM
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thanks guys but all that is in check... crank sensor in those trucks either work or it wont start... compression is weak but doesnt explain to me the feeling of a fuel starved engine... also my air fuel guage shows it starting at rich and leaning out completely off the gauge... wich pushes me in the direction of fuel pump acting funky but is alot of heavy lifting to replace... also it has a gutted dynatec high flow cat... and a cherry bomb extreme muffler so i know exhaust is free flowing... checked the valves and cam with a dial thingy and magnetic base same lift at all intake and exhaust well they're within 5 thousandths of each other... i doubt the valves r hanging and lobes are wiped out by that check... also replaced cam gear on the distributer and had the shop re time it though i was only off 2 degrees... i just dont wanna spend another hundred bucks and it not work again...
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Old 08-05-2011, 08:19 AM
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The fuel pressure on that should be 60-66psi. The amount of pressure you have should be enough to start it but probably wont run very good, kinda like what you are experiencing. Check the fuel filter to make sure it isn't partially plugged.
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Old 08-05-2011, 12:27 PM
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Possibly something in tank or screen on pump is gummed up. Unhook fuel line and pump gas into a can and see how much is actually coming out. Instead of dropping the tank to look at fuel pump, cut a hole in the bed of truck big enough to get it out then make a cover for the hole. Might try unhooking egr valve and plug the line and see if it runs better. Might be the module in dist.
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