garageman402
$100 Site Donor 2024
We have a Cummins Onan QC 4000 generator on our RV that doesn't get a lot of use. It was last run in August, & has been inactive ever since (about 7 months). Now it won't start. Our RV dealer doesn't work on generators, they sub it out, & there's warranty questions, so the shop foreman tried to get it going. He said when they sit like that, the carb gets gummed up from old fuel. He got it to run on carburetor cleaner, but that's all. He advised taking the fuel hose off & running Sea Foam through it. The hose is attached with a crimp clamp which I don't want to tamper with if it will void the warranty. The carb bowl has a drain valve which I have opened, & primed, fuel comes out when the pump is running. So we know it's getting fuel, we know it's getting spark, because it runs on carb cleaner. I attempted to spray Sea Foam & Gumout carb cleaner in through the drain plug.
The generator feeds off the main fuel (gas) tank, but only down to 1/4 tank so you don't get stranded. This is a 60 gallon tank, so I need to treat the whole 60 gallons to get it to the generator.
My question is what kind of fuel treatment would I use? Sea Foam is oil based, not sure if it would be effective. I'm assuming a PEA additive would be ideal? Would (3) 20oz bottles of Techron be a good start? I can get it to fire by holding the choke closed after priming, but it only lasts a few revs with choke closed or open.
The generator feeds off the main fuel (gas) tank, but only down to 1/4 tank so you don't get stranded. This is a 60 gallon tank, so I need to treat the whole 60 gallons to get it to the generator.
My question is what kind of fuel treatment would I use? Sea Foam is oil based, not sure if it would be effective. I'm assuming a PEA additive would be ideal? Would (3) 20oz bottles of Techron be a good start? I can get it to fire by holding the choke closed after priming, but it only lasts a few revs with choke closed or open.