1987 S-10 CHEVY NO FUEL SPRAYING AT FUEL INJECTOR. I HAVE CHANGED THE FOLLOWING FUEL PUMP AND SENDING UNIT, FUEL FILTER, FUEL INJECTOR, FUEL PRESSURE REGULATOR AT T.B., DISTRIBUTOR, ECM. STILL NO SPRAY AT INJECTOR. I DON'T KNOW WHAT ELSE TO DO? PLEASE HELP?

year/make/model/engine size??? Do a fuel pressure test to see what the pressure is. Low/no pressure= poor spray

1986 chevy s10 2.5l no gas coming from injector. - S-10 Forum

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Sep 2, 2009 - 24 posts - ‎7 authors I have no gas coming from my injector it a 1986 chevy s10 2.5l I have replaced the fuel pump,oil pressure switch & I checked and oil would ...

Check all engine grounds as the ECU relies on the control unit to find a ground and pulse the injectors. Also check the crankshaft sensor to make sure its pulsing when rotated. It should produce a 5 volt reference as it moves. Also check that you have fuel pressure as the pump also relies on a good ground to power up. Everything is controlled from the ECU.

you need to specify year , also , did you change one injector or all of them ?

Faulty fuel pressure regulator.

Need more info.......It could be the injectors are not pulsating...Check to see if it is spraying fuel from the injectors....If not it should be a clogged fuel filter or a fuel pump....It is almost definite though that it is the fuel pump/sending unit in the tank ...IF it is not spraying from injectors....
Disconnect battery remove main fuel line going in the fuel filter under vehicle frame at drivers side..with drain pan under it of course...Reconnect battery turn engine over and watch for fuel...
You will need an assistant...Most people think fuel is under great pressure but it is not.....If everything works the fuel will come out in a stream...But it wont come out like a bullet...
If fuel comes out Fuel pump in tank is good...Then your problem is at the injectors ...I would change the filter of course anyway...unless you just have...You will see rusty dirt come out of it if it is clogged...It is always good to change fuel filter every 15,ooo....Todays fuel is terrible...I would first check or swap fuel relay with a new relay or identical relay in fuse power block ...Make sure they are all good....................What engine and how many miles ? Hope this helps....Metalpoet

loosing fuel pressure, have you replace fuel pressure regulator, if the regulator is bad, it will have not enough pressure in between the injectors and the regulator. the fuel regulator maintain a proper pressure so the injectors will spray the correct amount of fuel every time the computer tells its to. weak pressure will cause injectors not to spray correct amount of fuel into the intake although will cause your engine to starve for fuel just like you have explained. the parts cost around 135 bucks and easy to replace.

always check fuel pressure and "pulse"at injector .

change the injector,its the only thing left

I have a 90 chevy k1500 350 tbi with same problem! I have traced problem to... after turning on key fuel pump kicks on when u crank it over injectors shoot gas and truck starts! After few seconds injectors stop spraying and truck dies! This can happen many times over and over! Eventually sometimes truck stays running and all is great! I changed ignition module, oil pressure sending unit (which i was told controls gas after vehicle is running) fuel filter, computer, fuel pump relay, I am at a loss now! Hope this helps and hope someone can help me!