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My 79 CJ 5 will start right up setting in the garage(flat),but in the driveway(incline)it will crank just fine until it rolls into the road(flat) where it will then start right up.My sons YJ does the same thing,is this common with Jeeps?Sorry if this is a repost.Thanks Tim
Yep. Gas won't reach the carb when it's pointing up as easy but it should still start after a few seconds. Maybe you need a new fuel pump.
Thanks White92, I was thinking that but with my sons doing the same thing i thought maybe common.We both have to let them roll to the flat to get em to start,so my guess would be fuel pumps.
Your son has a YJ with a carb ?
Anyway, I am thinking fuel level in the carb bowl. Maybe a float adjustment.
I am thinking the same person might have 'rebuilt' the carbs and missed the float adjustment. Or even someone removing the gas line to clean the float needle and missing or replacing with thin, the thick gasket or flattening it when tightening it back up. This would make the float too low.

My 258 will start up on a sand pit or ravine wall if I shut it down to take a photo or spot someone or something.
Adjust your float.
I'll throw this out, my 78 CJ5 I had many moons ago did the same thing, at that time there was a recall because the fuel bowls would drain all the gas out back too the tank, they put a check valve on the fuel line just before the carb, Bingo problem solved. This could be what you are seeing to.
One other one is the gas filter. If it isn't in right with the return line at the top of it, it can siphon all the gas back to the tank when it sits. The center line goes to the carb, the top line goes to the return.

Maybe it is on the side or something so when the nose is up, the return is lower than the center?

The later ones have a check valve in the pump so the gas line won't drain.
check your floats of course, but depending on which carb setup your running you can buy a set of baffles for the bowl, and it will make a world of difference.

g' luck

Tom
check your floats of course, but depending on which carb setup your running you can buy a set of baffles for the bowl, and it will make a world of difference.

g' luck

Tom

I wonder about those baffles. I hear lots of folks crying about the BBD not being good on inclines, yet my friends and I with them, regularly used to 'play' in a sand pit running the walls and the ravine walls. We don't stall from lack of fuel, ever. I go vertical until my tires are chewing in with ATV's flipping over behind me and she has never stalled.

I have rebuilt my BBD and helped my friends do theirs and we 'don't' have a baffle in the float bowls. I see it in the drawings and hear about it and saw one Jeep from the west coast that had one, but none here in southern Canada.