Check to make sure that fuel is actually getting to the carb.
I don't know of a really safe way to do this, but remove the fuel line from
the carb and direct it into a container. For myself, I would add an
extension to the line so as to make it long enough to get it out of the
engine bay entirely. If fuel is making it to the end of the line, then you
know that the carb has gas available.
If not, you have a few things to check.....
If fuel is getting to the carb, it pretty much has to be either a stuck
float or a blocked jet.
Did it run properly BEFORE you changed the fuel filter and fuel pump? If so,
then you need to go back and check your work and ensure you put your hoses
on right and hooked everything up properly. If it didn't run right before
replacing this stuff, then you probably replaced your fuel filter and fuel
pump needlessly, because you didn't find the problem.
Fuel pumps can be tested with a pressure gauge. If its pumping, its probably
good. If its spraying fuel out the vent, its no good. If you can blow
through your filter, its probably getting enough flow through it.
Sometimes the screen in the pickup tube in the tank gets completely clogged.
You can test this by having someone watch the fuel hose at the pump (take it
off) and then wrap a hose with a rag and blow into the tank fill tube.
Gasoline should come out the fuel pump supply hose. If it doesn't, you're
probably gonna have to pull the tank pickup tube assy and replace or clean
86 Trooper Carbs (IIRC) are a pain in the butt. I overhauled mine once. I
think you can get the fuel bowl off pretty easily to check the float and
needle/seat, but you need a carb kit to replace the gaskets. Somehow you're
not getting fuel, and I doubt its the carb - its probably in the delivery
system, but these things don't usually quit overnight. Its probably
something that was building up for a while that finally took its toll.
Hope this helps. Be glad you have a simple system. It makes it much easier.
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