Drain as much fuel as possible then blank all the fuel connections bar one. I blanked the fuel filler by using a mountain bike inner tube cut in half lengthways, knot tied in each cut end then stuffed down the filler pipe and inflated until it formed a good seal.
I left the fuel feed hose open, blew air into the tank to slightly pressurise the tank then connected this hose to a simple clear silicon tube making a 'U' shape with some oil in it. The oil level is forced up the silicon tube by the air pressure to a certain point. Mark this point and monitor for a few hours. If the oil stays at the elevated level then the air pressure is not decreasing. I'm sure simple pressure gauges can be purchased instead.
Drain as much fuel as possible then blank all the fuel connections bar one. I blanked the fuel filler by using a mountain bike inner tube cut in half lengthways, knot tied in each cut end then stuffed down the filler pipe and inflated until it formed a good seal.
I left the fuel feed hose open, blew air into the tank to slightly pressurise the tank then connected this hose to a simple clear silicon tube making a 'U' shape with some oil in it. The oil level is forced up the silicon tube by the air pressure to a certain point. Mark this point and monitor for a few hours. If the oil stays at the elevated level then the air pressure is not decreasing. I'm sure simple pressure gauges can be purchased instead.
breezy
