I think very soon it will be cheaper to replace your lift pumps like you do filters and your injector pump once a year than it will be for a tank of diesel.
But for the record, if not made properly it can be pretty acidic and cause damage to fuel lines, filters, pumps etc but if made right and tested all the way through the process then there is no problem and shouldnt be any worse for your system that diesel and in some cases better with more lubrication.
DONT BELIEVE EVERYTHING YOU READ.....there are some real nutters out there that make unrealistic claims (the secrate is one of them).
Go buy a book called
"from the fryer to the fuel tank", look it up, it is a good read and very informative but again is written by a bio nutter but one that has been very successful using Bio in many different vehicals.
I havnt tried it yet as I get fuel from work but Im nearly tempted to start making it at work for the machines as it is a huge chunk of our budget that is just getting bigger and our budget thus is getting smaller.
good luck and let us know how you go.
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