Originally Posted by Jyrocharlie
The vacuum pump you are using has more volume than the small fuel pump. Replace the line to the tank, the hose has cracks and is leaking air in, preventing the vacuum from the pump sucking fuel. Make sure the tank is over 1/2 full. Run a separate 12V line to the pump to test it without running the generator.
Agree, to the OP, cracked fuel line is a common problem especially with the blended fuel of today.
1999 35 ft. Dolphin 5350, F53, Banks System, 5 Stars Tune, Air Lift Air Bags, Koni Shocks, Blue OX TruCenter, TigerTrak track bars F&R, Roadmaster 1-3/4" rear auxiliary sway bar, 2004 F450 Lariat Pickup 6.0 Diesel Crew Cab DRW, 4X4, GVWR 15,000, Front GAWR 6,000, Rear GAWR 11,000, GCWR 26,000,1994 36ft Avion 5er, GVWR 13,700, 2,740 Pin Weight.