[GUMBALL]

Problem: Car stumbles (sometimes quits) on long freeway hills.

Ever since the initial fill up on my 42-gallon fuel cell, I have never added more than 27-gallons.

The car has no fuel level gauge. It has a fuel pressure gauge instead. I originally calculated 7.5 MPG for the car based on miles driven and fuel added to top off the tank.

I have noticed a few times now that after a long afternoon of driving, the car would start to stumble on long 2-3 mile inclined stretches of freeway. (like going over a summit) Now, once over the crest, the car drives fine. It always happened around 150 miles after filling up. I would proceed to the nearest gas station because I thought I was running out of gas. The problem is, it would only take around 22-27 gallons. Based on other's advice, I figured the problem was probably a misplaced pickup in the tank. That was until this weekend.

I had just filled the tank, put only 60-miles on it, and it stumbles real bad up a steep grade. I pulled off to the side a few times and it never quit, but came pretty close. Once again, after making it to the summit, I was able to drive another 30-miles home without any problems. Now, has the pickup in the tank moved again? ............. to a worse position? It also seems to happen more often on hot days. This could be coincidence. Could it be the float levels in the carb? Could it be poor tank ventilation? Vapor lock?

This last incident has me totally confused. Any ideas out there? How hard is it to check the level of the tank pickup?

Regards,

John