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350 motor's gas sensor and fuel injector - Express Chevrolet Cars & Trucks

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The common 350 has the usual sending unit in the fuel tank. There is a float that sends an electrical reading to the fuel gauge. The 350 either has multi fuel injection with 8 injectors or EFI with throttle body and 1 injector depending on the vehicle and year

Posted on Dec 31, 2010

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Lost me there at"injectors don't fire, but they do" Anyway, the crank sensor/ECM is what controls injector fire. Could be corrosion at the injector,crank sensor, or ECM plug. Could be the injector/s died. Been a long time since I worked on a TBI. but the injectors can be checked with an ohm meter. I don't remember the numbers though. You can find the numbers on the internet.

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i'm pretty sure you have a Central Port Injection setup on this engine. Which means the injectors are inside of the upper plenum and cannot be seen. This type of fuel injection system uses a centrally located electric fuel injector(s) which feed fuel to a mechanical poppet style injector which is routed directly above the intake valves for each cylinder.

The poppet valves require a minimum of 56 psi of fuel pressure. If you have 55 psi it will not start. It needs the fuel pressure to overcome the mechanical resistance of the poppet injectors. Fuel pressure should at least be 60 psi. It is very important to check fuel pressure with an accurate gauge.

If fuel pressure is low it will not start no matter what you do and a new fuel pump will likley fix the problem. Get a good quality pump such as an a/c deco or Dephi. Other brands may be cheaper but they will not last.

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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!

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