Questionthe truck has a 350 w/ TBI carb. the other day it stalled and would not start due to no fuel even though the tank was full.next morning it started right up then died on my way to work. i changed the fuel filter and it was very dirty. now i cant get it to start unless i pour a little gas in the carb and keeep it at a high idle for a minute or so. then the truck runs fine. why does the carb not have gas in it for initial start up but has gas flow to keep it running? if i shut it down and start it up within an hour or so, it will start fine, but will die right away if i dont keep it on a high idle for a minute or so. Any help to this pain in my butt would be greatly appreciated.
AnswerOK, You have one or more of the following problems:
NOTE: Since the fuel filter was very DIRTY:
There is most likely alot of debris in the fuel tank usually caused by a gas stationthat has a leak in it's underground storgae tank and this leak allows water and sediment into the large storage tank of which gets pumped into your gas tank.
1. The dirt gets sucked up against the filter sock located at the bottom of the electric fuel pump of which eventually starves and or reduces the fuel PRESSURE and fuel VOLUME being supplied to the fuel injectors. When the filter gets completly clogged NO or very little fuel gets thru the filter thus starving the engine of fuel. Once the engine stops the fuel pump stops and the debris falls back off the filter sock due to loss of suction from the fuel pump and returns to floating in the fuel tank and settling back on the bottom of the fuel tank. Once you restart the engine the debris starts to replug up the filter and this process is repeated over and over.
There is a small by-pass built into the pump that allows a VERY SMALL amount of fuel to by-pass the filter in order to allow the engine to SOMETIMES run in order to LIMP HOME. However if theis by-pass also gets plugged up, The engine receives NO FUEL what-so-ever.
Therefore you MUST:
1. drop the fuel tank.
2. Remove the fuel pump.
3. replace the fuel pump as it is in most cases damaged due to fuel starvation in 80% of all cases.
4. replace the filter screen.
5. drain and flush out the fuel tank using a flushing agent.
6. Install a new filter screen, Pump, add GOOD CLEAN fuel, and 2 containers of DRY GAS or similar product to the fuel tank.
7. Disconnect the fuel filter fuel lines at the filter and at the throttle body and flush out the lines.
8. Install a new fuel filter an reattach all the fuel lines.
In SOME cases debris gets past the fuel filter and clogs the fuel injectors and IF your LUCKY the dry gas or similar product will break up the small particles of debris and flush it from the injectors. If NOT, You will have to replace the injectors.
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