Question about 1995 Chevrolet Blazer

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95 Blazer Vortec starting problem.

Thanks for the insight on my Blazer problem, but their is already a new pump and sending unit. Twice I have replaced them. Is their any thing else you can give me that might help?

Also I heard that if the throttle positions sensor sends more than 6 volts to the ecm it will not send any fuel. Is this true?

Thanks RPM Northwest

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  • Charlie
    Charlie Jan 29, 2009

    I will have to invest in a fuel pressure gauge. If their is not enough pressure then what could that be, the pressuer regulator?

  • Charlie
    Charlie Feb 01, 2009

    From what I seen on it their is no vacume lines on it. This motor is the one that has the horizontal cap. The motor id on the vin is the "W." I dont know if their is any diffrence in the regulator with the diffrent cap but I am about out of solutions and ready to scrap it


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The TPS has three wires that go to it in general. You have a power lead (constant 12 volt source) , a ground, and a variable lead of 1-5 volts. If you do not have a 12v constant source check for an open or short in the sensor harness. Now you had the TPS replaced, and no start. What is your fuel pressure? If you check your fuel pressure and it is on the low side of range it will not start, nor if it does start run well.
I have to run for parts but will be back shortly. I will get back on line and be available for chat if you wish so we can figure this out further.
RPM Northwest

Posted on Jan 29, 2009

  • Rich Palmer Jan 29, 2009


    A real easy test for the regulator is to pull off the vacuum line at the reguator. If there is fuel present in that line the diaphragm is bad and the regulator needs to be replaced. If your fuel pump pressure is a the low end running, take the regualtor hose off the regulator, plug it, and see what the pressure is then. If you have no change, the regulator is bad. On a side note, I have seen new pumps being bad. I went through three on one truck. Not enough pressure. Hope this helps.



    RPM Northwest


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