1996 S-10 4.3 modified vortec V-6 no start after warm up

Asked by May 02, 2014 at 11:04 AM about the 1996 Chevrolet S-10 2 Dr LS Extended Cab SB

Question type: Maintenance & Repair

Oops My little road racer has developed that has me puzzled. I've replaced everything on top of the engine as I built it over the last two years. Last week the kid borrowed it and brought it home on empty, Duhh I later took it to the same station I've used for 10 years and fueled it up, fueled it to the top and packed in as much as I could in anticipation for a road trip. I went inside for a cold beverage and when I came back and tried to restart it started right up as usual but then kind of shuddered, idle dropped off and it died. I just kind of figured I was lucky and hadn't run out of gas before I got to the pump. I cranked it over a few times and no start. My sliding rear window was open and I could smell raw fuel. I cycled the fuel pump four or five times by turning the key on and off. Still no start so I sat there for a while with the throttle pedal pressed to the floor hopefully to let any excess fuel evaporate or boil off. Called for a ride and tried once more and the old dime fired right up

When I got home and stepped out of the truck more strong raw fuel odor. I see no gas under the truck I can just smell it.  I have a gal pal that has watched my build from the start and finally decided she was ready for a ride. The truck fired right up and I decided to blow the cobs out of it and maybe burn off some gas, it ran great and when I got back to the house it didn't smell of gas so I thought all was well,,wrong. The same thing happened again when I picked my granddaughter up from school. started up just great ran fine until I shut it off at school. About ten minutes later I fired it up it idled just fine and while sitting there talking with her it shuddered and idled down and died. No start Hmmm was it flooded or lacking gas again I cycled the key it had pressure but no start so I mashed the gas for about five minutes and then it fired right up again and ran fine again.

  The mods I've make to the crate 4.3, New mpi replacing the stock scpi with AC Delco parts new distributor, wires, plugs, 78 mm bored and polished throttle body cold air induction 5.7 MAF new MAP sensor, coil, Headers new exhaust from headers to new cat new mufflers ect. The only thing not new is the gas tank and fuel pump but it is putting out 65 pounds ket on motor off and drops to 55 at idle all within specs. any clues aas to where I might start??

2 Answers

Fuel pressure regulator.change fuel filter.sounds like fuel problem..vapor lock..

16,255

how is the fuel pressure leakdown rate when you turn the key on/engine off

Your Answer

Add photo

Related Questions

  • why won't my chevy s10 4.3 v6 start after running it a while 17 answers

    After running my truck for awhile I shut it off and then have to wait for sometimes over an hour for it to start again I have changed the coil pickup and put ne distributor cap and rotor on it

    1991 Chevrolet S-10

    -

    Maintenance & Repair

  • 1996 Chevy S-10, 4.3 V6, will not start in morning 4 answers

    Having trouble starting in the morning, cant tell if it is in firing or not getting fuel, takes 30-45 minutes to finally get to fire and then start....

    1996 Chevrolet S-10 2 Dr LS Extended Cab Stepside SB

    -

    Maintenance & Repair

  • 1996 s-10 starting issues 2 answers

    I have a 1996 s-10 . The truck starts great when its cold but when I drive it and it gets warm, it doesn't want to start right up. It turns over several times and I usually have to pump the gas 1-2 ...

    1996 Chevrolet S-10 2 Dr LS Standard Cab SB

    -

    Maintenance & Repair

  • 94 s10 4.3 6 answers

    i have a 94 s10 4.3 and when it runs about 20 min the top radiator hose builds up alot of pressure and get so hot u can barely touch it, i put new thermostat and water pump on it but it still does the...

    1994 Chevrolet S-10 2 Dr LS Extended Cab SB

    -

    Maintenance & Repair

  • 2000 chevy blazer 4.3 10 answers

    While warming up the 2000 Chevy Blazer 4.3 Vortec after about 10 minutes I got in gave it a little throttle Gas and it abruptly died and would not start again there is no spark and when trying to ...

    2000 Chevrolet Blazer

    -

    Maintenance & Repair

Search Chevrolet S-10 Questions

Chevrolet S-10 Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 2,060
#2 John Saffrahn
John Saffrahn
Reputation 890
#3 Trebor66
Trebor66
Reputation 880
View All

Related Models For Sale

Used Ford Ranger
225 Great Deals out of 7,011 listings starting at $1,450
Used GMC Sonoma
10 Great Deals out of 510 listings starting at $1,500
Used Toyota Tacoma
799 Great Deals out of 33,979 listings starting at $2,499
Used Ford F-150
3,453 Great Deals out of 206,229 listings starting at $1,273
Used Dodge Dakota
150 Great Deals out of 4,361 listings starting at $1,500
Used Chevrolet Blazer
1,382 listings starting at $1,699
Used GMC Sierra 1500
1,177 Great Deals out of 58,309 listings starting at $2,495
Used Dodge Ram 1500
551 Great Deals out of 13,019 listings starting at $1,800
Used Chevrolet C/K 1500
3 Great Deals out of 1,058 listings starting at $1,999
Used Chevrolet Camaro
655 Great Deals out of 39,478 listings starting at $3,495
Used Chevrolet Tahoe
1,103 Great Deals out of 31,960 listings starting at $1,495