Do you have to drain the gasoline tank before using cng in a bi-fuel?

Question

I have a bi-fuel truck that has run on gasoline only, what do I do to fill up with cng?

Answer 1

Best Answer - Chosen by Asker

no you dont need to drain the tank just use the gas till it is about 1/8 of a tank then fill up with cng
happy trucking

Source(s):

mechanic friend

Asker's Rating:

Asker's Comment:

This sounds about right, I worked with industrial lifts that run on gasoline and propane and you only have to push a button to switch between fuel type. but the only doubt that I have is cng has higher compressed content.

Answer 2

I pray you don't actually think you can just pour CNG into a petrol fuel tank...DO YOU?? If so please have the courtesy to inform your neighbors in a two mile radius before you attempt this. At least they will have a chance of surviving the blast.