Sc 400 when going uphill for a short while engine quits.

[Thomasq]

My SC 400 engine works perfectly on flat or downhill. When climbing a steepish road after 10 minutes engine stops. Changed fuel pump and  problem continues. 

[BenchTest]

Can this be replicated by putting the vehicle on ramps and letting it run?

[Thomasq]

 Thanks for the suggestion. Will look around for a ramp that can be angled and still have freedom for the wheels to work. Looking at the computer since  check engine lights turn on and OFF!

[BenchTest]

You say "stops".  Does that mean, shuts off completely?  If so, does it start right back up or what happens?