I have seen people on the forum over the years occasionally mention they like to route their fuel lines inside the frame rail between the crank case arms and frame.
My question is: Are there Models/years that Ford actually routed their fuel lines this way, or is this just "personal preference"?
The Ford Service Manual shows the line routed between the crank-case arm & hogshead. The 2 frame-off firetruck restorations I have done also had their original tin-plated seamed brass fuel lines and both were routed exactly as shown in the Service Manual.
I would be real interested to hear what years/models were routed differently, and if there is good documentation available.
Here's a picture from a 1922 Ford service bulletin showing the fuel line routed inside the frame rail:
I don't think the illustration above is that accurate, even though it is genuine Ford. The early crankcase arm blocks had a rabbet on the top to clear the upper crankcase arm bolt. This illustration doesn't show that. The bottom side of the block had a bevel, and perhaps that is what is shown in this illustration, even though it appears to me to be a rabbet. It is also interesting to note, that the runabout is still called a torpedo.
My '14 the fuel line goes between the crankcase arm and the frame thru the rabbet in the wood block, like Larry said
1909 - 1911 fuel line runs on top of the frame rail.