l have an old rh4 that l use for odd jobs around the place, old machine but works ok when it works,
always seems to have a problem with fuel filters blocking up and stopping the engine, the tank is so full of muck l think l need a shovel to clean it out, was going to do this the other day but when l looked at it the tank is part of the structure and is welded in
why would you make a tank that you cant remove and steam clean out, surely the manafacturer must know that it will get full of crap and need cleaning out out some point in its life ?anyway thats a job for another day a sunny one preferably, but for now l have just made a remote tank thal will mount on the rh4 above the standard one and plumb it straight to the fuel pump throught a filter of course
found a lpg tank that came in the back of a range rover l bought once in the barn that fitted the bill nicely and as it was unused it was squeaky clean inside
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made a couple of feet for it so as l could pick up with a couple of exsisting bolts on the top of the old tank,
made one end 2" taller on purpose so as l could have an outlet at each end on teh bottom, the lower one as a drain for water and the higher one as the fuel out to the pump
on top was a plate with 5 fittings which all unscrewed, welded up the 2 holes l dident want, converted one of the old pipe conections to a filler plug,
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there was a neat little gas/fuel level gague that was all mechanical brass float turning a brass cog that turns a needle in the gauge, will reuse that l guess it will work in diesel as well as liquid gas
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found an air line connector that screwed into the last hole to use to connect the breather/spill back to
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quick coat of green paint and its ready to bolt on
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well it was a way to pass a sunday afternoon if nothing else
Andy
Some designers do a good job but don't take into account the practicalities of site work and the very good chance that there will be an ingress of crap .
Just shoved a steam lance in the filler and flushed it. Took a while but worked in the end.
why tanks are designed with no cleaning access. 
