i have a 1990 jeep cherokee with the 4.0 inline six that will not start it has been sitting in my drive way for about six months i parked there it was running fine i have the battery out now charging it but i tryed to jump it and it was like it was not getting gas even know i know that there is gas in it (new air filter and gas filter right before i stopped driving it) i pulled the gas line off just past the filter and gas came out so i dont know

does the engine crank and just not turn over?

if it cranks, are you getting spark? fuel?

try spraying a small amount of starter fuild in the intake while someone is trying to start the engine. it the engine catches and then dies, your not getting fuel.

im not sure if your year jeep is fuel injected or TBI. if its TBI you might have some gummed up remains of fuel blocking the passages.
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3 Explorers and 1 Ranger
2002 Nissan Sentra SE-R Spec v
1970 Ford Mustang Mach 1
1969 Ford Mustang Mach 1
1968 Ford Mustang 302 Coupe

it tunes over but dosnt start. i did put starter fluid in the in take and it when then choked out so it is getting spark and i am pretty sure its fuel injec. but i have never heard of the other and it has fuel injectors so if that help

TBI Throttle Body Injection. looks like a cross between a carburetor and the new models throttle body.
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3 Explorers and 1 Ranger
2002 Nissan Sentra SE-R Spec v
1970 Ford Mustang Mach 1
1969 Ford Mustang Mach 1
1968 Ford Mustang 302 Coupe

no its fuel injection

No matter what type of fuel injection for now it simply isn't getting fuel. Fuel pressure test would help. If this was left for six months with less than half a tank I'd worry about moisture in the gas now too.

Gas is not very stable IMO as I have pronounced problems with seasonal equipment that wasn't a problem many years ago. Strange additives being used now,

T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/

Not a real Jeep guy but I do know and have fixed a couple a 4.0 L by replacing the Crankshaft position sensor..
These are very common failures...
And they do start the fuel pump /injector circuit..From what I understand....
Located on the bell housing of the trans ,drivers side....Pain in the *** to replace on 4x4 models...

Just a thought...Let us know.....

Crankshaft Position (CKP) Sensor 4.0L