dave88sw Posted July 2, 2015 Share Posted July 2, 2015 Hi, I'm currently trying to get an old 90 back on the road, it's a 2.5 NA diesel and has been sat in a yard for about 7/8 years. I've got it started and it runs quite well but i can't help but worry about the fuel in the tank. It was laid up with a full tank, i've had the sender out to have a peak in the tank and it looks clean and smells fine but it's probably a bit stale. A few people have told me to stick a couple of litres of petrol in as a cheap "additive", are there any downsides to that idea? Thanks Dave Quote Link to comment Share on other sites More sharing options...
Les Henson Posted July 3, 2015 Share Posted July 3, 2015 Don't do that petrol deteriorates with age (goes rancid), but diesel doesn't tend to. The only problem you may have is corrosion of the tank itself, or water/sediment in the bottom of the tank. If there's not much in it, then drain, check, and put it back in. Some diesel injector/cleaner will help, but that's all. Les Quote Link to comment Share on other sites More sharing options...
AMB Posted July 3, 2015 Share Posted July 3, 2015 I agree with Les. Diesel doesn't tend to go off, but can get contaminated. Unless the tank is almost completely full, you will almost certainly have accumulated water through expansion/contraction and resultant condensation build up. If there is water in the fuel, you can get fungal/bacterial growth in the water/fuel interface which forms a black slime. In mild cases you can treat with a biocide (available from marine suppliers) and a few frequent filter changes. Some diesel injector treatments actually include a mild biocide. If severe, then drain etc is required. Quote Link to comment Share on other sites More sharing options...
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