What could be causing me to have bad feul pressur ?

Not likely. The cam and crank sensor inputs are required for the ECM to provide spark. The fact that it starts with starting fluid would lead me to believe that those signals are present. You say there is no injector pulse. Did you test this? Or are you assuming that since you have fuel to the injector, but not into the cylinders? CPI systems only have one injector and they can fail. Also, while fuel may be present, if the pressure is not sufficient, the system will not operate. Here is a link describing the system and things you can check to diagnose problems. Lastly, the ECM itself could be the problem....


GMC Chevy Light Truck Central Port Fuel Injection Diagnosis

Is your "Service Engine Soon" light on?

Have you scanned for fault codes?

I would suspect low fuel rail pressure...caused by a tired fuel pump.

Before considering a faulty PCM see here for more information and diagnostic tips:

Courtesy of 2CARPROS -


Have 1995 Chevy Blazer V6 4 3 Vortec and It Ran Ok but We Had

what did you do (replace it) if you still have a miss you may need to tune it up / make sure the fuel pump you bought is for the right psi for your blazer

You first need to run a fault code test on this engine, to do that go here.

I had this problem.I removed the fuel pressure regulator and it was full of carbon.Remove it very carefully as to not damage any seals.Remove as much carbon as you can and reinstall.This should solve your problem.

try the ignition module. if it is bad it does not send the signal for the the throttle body injectors to spray feul.

How is it running before it quits onyou. This could be the culprit of an egr valve. How many miles on thevehicle. The egr seems to die on a certain mileage pattern. Also youcould start by cleaning the egr valve before replacing it. This couldvery well help the situation, but this is just a guess. Hope thishelps!!

THE FUEL PUMP IS BAD.

if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.

and i doubt that you are seeing enough fuel pressure to run a vortec engine.

low fuel pressure equals a non running vortec

Replace with Standard Part # FS503 about $300...complete new unit with all you need but plunium gasket worked wonders for my blazer now gets about 19 mpg

I have the same problem with my 95 blazer I have heard that it is the fuel pressure regulator. That is the next part I will be replaceing.

Good luck to all.

If any one finds any thing out please let me know!