When it warms up it statrts sputtering as though the gas is not making a connection

SOURCE: won,t start

sounds like it may be and ignition relay falling out. i think there is 3 of them under the hood. have to ask is there fuel pressure, spark. i know you changed them but why.

SOURCE: Engine starts then dies, replaced filter,pump,and

check fuel pressure to the fuel rail to see if you are recieving fuel to the fuel rail if so the injectors are suspect

SOURCE: i have a 1993 s10 blazer 4.3l 6cyl cpi. this truck

I had the same problem in my 91' s10 blazer. Drain the tank, then put about 5 gallons of premium gas. After that put fuel system cleaner and sea foam in the tank. Let it sit their for about an hour. try to crank up the car (you might have to put gas right on the carb until the gas in the tank gets to the engine). If that dose not work you might want to take it to a shop and have them clean the fuel system by hand. It might also be the fuel sensor. I hope this helped also up date us on other problems and if any of our suggestions have helped.

Ray Jones

• 97 Answers
• Posted on Aug 07, 2009

SOURCE: warm running problems

If you have fuel pressure when the engine is warm you must have an electical problem--try getting ur coil checked--make sure engine is warm when u check it.

Jeffrey Turcotte

• 8991 Answers
• Posted on Dec 08, 2010

SOURCE: overreving with no power and

usually caused by busted diaphram in fuel pressure regulator allowing fuel to be drawn thru regulator directly to intake manifold. Pull vacuum line off regulator, plug line with golf tee, start car and watch to see if gas comes out of regulator. If yes, turn off car, replace regulator. The regulator sits near the fuel rail on the top of the engine as shown below. I will paste replacement instructions below from autozone.com in case you need to replace the regulator. Please let me know if you have any questions.

Removal & Installation

4.2L Engine

1. Relieve the fuel system pressure.
2. Remove the air cleaner outlet resonator.
3. Disconnect the engine wiring harness from the retaining clips at the front of the engine.
4. Disconnect the fuel pressure regulator vacuum line.
5. Clean any dirt from the fuel pressure regulator and the surrounding area.
6. Disconnect the fuel return pipe.
7. Remove the fuel return pipe retainer.
8. Remove the fuel pressure regulator retainer.
9. Remove the fuel pressure regulator.
10. Inspect the regulator filter screen for contamination. If contaminated, replace the fuel pressure regulator.

1. Install the regulator filter.
2. Install the new O-ring on the fuel pressure regulator.
3. Lubricate the fuel pressure regulator O-ring with clean engine oil.
4. Push the fuel pressure regulator into the regulator housing on the fuel rail.
5. Install the fuel pressure regulator retainer. Tighten the regulator retainer screw to 71 inch lbs. (8 Nm).
6. Install the fuel return pipe retainer. Tighten the return pipe retainer screw to 71 inch lbs. (8 Nm).
7. Connect the fuel return pipe.
8. Connect the fuel pressure regulator vacuum line.
9. Connect the negative battery cable.
10. Inspect for leaks:
    1. Turn ON the ignition for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Turn ON the ignition.
    4. Inspect for fuel leaks.
    
    
11. Install the engine wiring harness into the retaining clips at the front of the engine.
12. Install the air intake resonator.