On my '75 coach, there is a cut-out in the floor insulation just in front of the left mid wheel for the propane line (I think).

There was enough space for me to snake both fuel lines from the tanks through there. The other option I was thinking of was to cut a notch out of the insulation further up, along the frame, but since I had room farther back, I just used the existing one.

I had the same issue, compounded by a full-length body pad that I'd have to clear for the fuel lines. I assume you want them on the outside of the frame for ease of maintenance. I wanted to mount two sets of filter/fuel pumps using an in-line filter and pump.

I ended up mounting the pump/filter combination on two 3/16" plates (one for each set) wide enough to capture the 'U' clamps that would hold down the filter and pumps, plus the width of the bottom of the frame rail and long enough for both, plus the short rubber nipple in between, plus a couple inches. About a foot long and 6" wide.

These were drilled for 1/4 bolts and nuts that fastened the filter and pump, and tapped for two 1/4" bolts that pass through the bottom flange of the frame rail and screw into the plate. The filter and pump were mounted facing up so that the plate provides debris protection from below.

I left some slack in the fuel lines, so accessing the filter and pump while laying on the ground next to the coach on the side of the road means...

Removing the two 1/4" mounting bolts, lowering the plate/filter/pump assembly and twisting it a little so that the filter/pump faced outward, hanging on the fuel lines. The filter, pump, mounting clamps, and fuel hose clamps were right in front of me and easily reachable.

Here is a repeat of this post WITH PHOTOS on the gmcmhforum

Carl S. wrote on Tue, 25 February 2020 13:31

On my '75 coach, there is a cut-out in the floor insulation just in front of the left mid wheel for the propane line (I think).

There was enough space for me to snake both fuel lines from the tanks through there. The other option I was thinking of was to cut a notch out of the insulation further up, along the frame, but since I had room farther back, I just used the existing one.

Thanks Carl. Sounds like you are talking about the holes in the cross beam. They will be run through there. It's getting from the inside if the frame rail to the outside that I am trying to accomplish.

Both my coaches had the lines in the original location. With electric pumps vapor lock went away. Getting smacked in the side is a common accident around here from distracted drivers running lights and stop signs. Consequently, I don't want the fuel lines outside the frame.

--johnny

Thanks Carl. Thats look pretty much exactly like what I'm trying to accomplish. You must have more room between the frame and body then i do. Did you move the emergency brake cable somewhere else? Also, did you run the lines back over the frame again to bring it back inside the frame rail after the selector valve?