Injectors are not putting fuel into the TBI and eng wont start
Have replaced the pump relay and checked all fuses could find none bad engine turns over but injectors are not putting fuel into the TBI and the engine will not start will start if fuel is poured direct into carb and runs until depleted have also replaced the manifold actual pressure sensor still to no avail can you suggest a possible solution thank you
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Then your fuel pump is not working, or your fuel filter is blocked. You will probably have to check your fuel pump circuit if you have no fuel pressure in the fuel rail, where the injectors sit. There is a fuse for the pump, usually in the under hood fuse/relay block. That is probably also where the fuel pump relay is located. You should hear or feel this relay click when the ignition key is cycled from off to on. Also, when the key is turned to on, you should hear the fuel pump in the gas tank turn on for about 2 seconds. This will put the pressure in the gas in the fuel rail, for starting the engine. If you don't hear the pump turn on for that 2 second period, it is probably a bad fuel pump. But know the fuse is good first.
First, make absolutely sure the fuel pump is running when the key is on and is pushing fuel to the TBI. Take the feed line off the TBI if you have to. Watch it, fuel will spray everywhere if you aren't careful. Most fuel pump "no run" problems are caused by a bad ground. Use a VOM to check for power and ground.
Make sure the injectors receive power when the engine is cranking to start. Might be something as simple as a blown fuse. Can check with a noid light or 12v test light. Remote possibility of the injectors losing power when via the ignition switch and/or wiring when you crank the engine.
Fuel pressure regulator may be defective. TBI must be disassembled to replace it. There is a nice aftermarket adjustable regulator available.
Internal to the TBI itself (SOME, BUT NOT ALL HAD THIS) is a small neoprene pressure bleed. It has a VERY small hole in it, used to slowly bleed off the fuel pump pressure when the engine is shut down. If the diaphragm ruptured the fuel will return to the tank, never building enough pressure to spray out the injectors.
These units are relatively easy to rebuild. Youtube has several good vids walking you thru the process if you have any doubts.
`Probably the fuel pump in the tank has stopped working. Verify with a check for power at the gas tank connector: When the engine is cranking, the fuel pump wire should have power on it-use a test light or voltmeter. If the wire has power, but pump will not turn on, the gas tank will have to be removed to replace the pump. Just by turning the key to on, not start, will or should cause the fuel pump to come on for about 2 seconds to pressurize the fuel lines and put gas under pressure against the fuel injectors. If you don't hear the pump buzz on for a brief time, you know you need to check the fuel pump circuit. Check fuse, check fuel pump relay...but the easiest way to verify a bad pump is to check fuel pressure, or check for power at the gas tank when the engine is cranking. No power is a fault in the circuit (fuse, relay, wiring), power available to the pump but no pump means the pump will have to be replaced .
If the engines fires up when you pour fuel into the throat of the TBI, then it isn't ignition related
I'd replace the fuel filter (relatively inexpensive) then see what happens.
If it still won't start, check the cranking fuel pump pressure. If no (or low) reading, you may well have a bad fuel pump. Also can check fuel pump relay, to make sure you're getting power to the pump.
undo the fuel line where it joins the fuel rail to your injectors.. it is under extreme pressure so be careful.. get someone to crank car for a second or two and if fuel sprays out then its not a fuel problem..
my injectors have no power ging to them. i just replaced fuel pump and relay. i have fuel going to my 350 tbi but nothing coming out the injectors. it wont start and i have no power at the injector so i dont know if its the ecm or what