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1986 GMC C1500 High Sierra 6 Cyl 4.3L seems to have a fuel delivery problem...While driving, it almost stalls but the tank is full...Think it might be a fuel pump issue?
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look for shaking of the fuel line at the carburetor . If it shakes while moving it could causing a vapor lock. also, when it stall , you might have to check the fuel delivery at the carb. open the connector and see if fuel is being delivered, when it stalls. . This is very dangerous. so be careful , because today's gas is explosive, not only flammable.
Did you have the fuel pump pressure tested./ A local parts store can probably give you the psi it should have when cranking the engine. I used to use a clear gas filter before the carb. and when mine stalled, I quickly jumped to see if there was fuel in it. And last but not least least, does it stall on one tank or on both tanks.?
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The fuel regulator just keeps enough fuel pressure for the injectors. When the fuel is at the right pressure it just goes back into the tank. 6 mpg is definately not right. The only thing I can think of that would use that much fuel is a leak. I am sure you would have notices the smell of gas though. Even if the o2 sensors were bad it would not use that much gas. What engine is in your truck?
it is definately a fuel problem, if you press gently it speeds up step on it and it just bogs, i think it has sommething to do with the ecm that controls timing and fuel at the TBI (throttlebody injectors) not a filter, i put a new pump,tank,filter and cleaned out the fuel lines and still could not cure the problem, then i heard of a few thigs that got me thinkin but when i was gonna tackle it a guy said he wanted to buy it so i told him the issue he didnt care and i sold it. but those were the only things left to do.
On a 95 I think it is on the frame rail.Looks just like a gas fuel filter but with wires in it.You can look up the part at rockauto to see the part.On drivers side.
Could be dirty fuel injectors or some water in your fuel. STP fuel injetor cleaner or HEET water remover on next full tank of gas should solve this. Use one or the other not both
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