I had a similar issue. Unfortunately, I do not have a good suggestion, just a story about how it worked out for me.
carries 400 gallons and the Perkins
4.236 85hp burns under 1-1/2 gph. I've had her for almost 25-years and last time I filled up was about 20-years ago - she's been sitting for years as a pied a Terre in SF. We aew getting ready to retire and cruise
her, so it's time for a sorely needed refit
. Last year, I decided to bring her from SF to Ensenda for a total refit
which is underway.
I had about 150-200 gallons of roughly 20-year old fuel
aboard. I can tell you diesel definitely has a shelf life - one side smelled more like linseed oil
than diesel. I've used the same mechanic
for well over 20-years and trust him. He strongly advised disposing of the fuel
....... until he found out the price
, which would have been at least $4000. I needed about 120 gallons to make the 500 nms run to Ensenada and part of the refit was planned to repair or replace the fuel tanks
, so didn't want excess fuel aboard.
We decided to triple dose with Stanadyne (find it at Diamond Diesel in Oakland) which was also recommended by a friend who works for Deere Marine Propulsion
. My understanding is its a fuel conditioner that helps keep asphaltines from precipitating out. I also added 80-gallons of fresh diesel.
I did about 20-hours of local sea trials and the engine
ran fine so made the decision to just go for it. Ran about 75 engine
hours straight through to Ensenada. The pressure on racors came up a bit and the clear bowls were dark as night from old tarnished fuel. I ran mostly on the tank that didn't smell as bad though.
I ended up replacing both fuel tanks
so tried to unload the old fuel - 250 gallons, or over $1000 worth of fuel. Tried giving it away to the local fishing
fleet. When they saw the fuel in a Mason jar, even they wouldn't take it. But my old Perkins
ran fine with it. Doubt a newer Tier 3 (common rail) engine would.