The PO of my 1984 310 had horrible problems with no power on hills. He even put on a Banks which is nice but didn't correct the problem.
The problem turned out to be a contaminated fuel tank, it seems that crude in the tank was limited the amount of fuel that could be pumped. He had the tank removed, cleaned out and sealed, problem solved.
If you want others to be happy, practice compassion.
If you want to be happy, practice compassion - The Dalai Lama
1984 310 Limited Motorhome
Courtesy Parking (W/S/E/Wi-Fi) on I-5 in Northern California, 70 miles from Oregon border