Originally Posted by Hightower
Osprey have been fitting GRP fuel tanks to their Vipermax range (and probably others) for years and don't seem to have any problems. However before you go off to build one with standard materials I beleive they use a Petrol resistant resin in the make up.
Not sure about building them in situ. Better on the bench and then fit them after.
There are CE rules about this, and as I understand it you can't have a built in petrol tank, in addition Scott Bader who supply our materials don't do a petrol proof resin, especially with them changing the make up of fuel all of the time.
The US has had many problems with the additives in their fuel and GRP tanks with them disintegrating and bits getting to the motors and causing lots of damage.
We have a Diesel boat with a built in tank which is fine.