This means it lacked power all the way up the hill or the power gradually dropped as you climbed the hill? Is the engine also running rough when the problem occurs like one cylinder is missing? Checking fuel pressure on a K-jetronic system requires a gauge, hoses, and valve unique to this system. Must be able to measure pressures up to 70 psi. I believe JC Whitney has a good kit for the lowest price. You may also be able to get a pressure gauge kit at a parts store but make sure it is specifically for the K-jet system, looks like the ones pictured on the K-jet websites, and can read the high pressures.

My son's 89 S-10 Blazer had a weak electric fuel pump. It would start but barely pull its own weight. Since there was gas flow and it was time to replace the plugs, cap, and rotor anyway, we did that first. It ran a tad better but obviously wasn't fixed. Removed the fuel filter and it was clear (could blow through it). Cranked it over with the filter removed and there was gas flow but it looked weak. Connected a pressure gauge to the end of the open line and cranked it again. Had 2 psi. Checked the manual and it called for 10-12 psi. Went ahead and changed the pump and that fixed the problem. I've replaced three electric fuel pumps on differnent vehicles and that's the first one that was weak. All the others were locked up or had a burnt out motor so zero fuel flow. An 83 with a B23F runs 35-40 psi of fuel pressure. Good luck. jp