Just fitted a Prins VSI lpg conversion to a 2003 5.4l \f150 HD to make it a bit more economical - the price of petrol here is currently around $8 per imperial gallon!

The problem is the Service Engine Soon light keeps coming on; we've pulled the code and its coming from the fuel tank sender unit; we suspect its not registering any movement on petrol usage so its throwing a code at us. We can clear the code but within a couple of days its back, we have to check it every time to make sure its not something else so its starting to get irritating now.

Anyone come across this problem before?

Thanks