relocation

I have a 2005 ML350 with an LPG conversion. The filler cap is on the rear quarter 6 inches or so to the upper left of the fuel flap. I am getting some bodywork done next week and want to relocate the LPG filler. I have pulled off the left cover on the bumper, and I am pretty sure I can relocate...

In this month's MB Club Gazette, there is an article on relocating the MAF on the M111 engine of a 1996 SLK230. Basically the MAF on these usually sit vertically down the side of the radiator, but apparently relocating it to the horizontal position close up to the throttle body is supposed to...