I'm about to install a multiway connector in the engine bay to another connector under the dash. I want to install the connector on the LHS of the engine bay and run the cable inside convoluted conduit to the underneath the van and then to the front. I was thinking about drilling a 10mm hole above where the fuel hose enters the engine bay and then feeding the cable through. Can this be done with removing the firewall and are there any obstructions behind this area that will cause problems?
How big and how many wires are you running in?? A good place to run it would be on the N/S chassis leg around the area where the reverse light wire, some vacumme hoses go. This way you won't have to dismantle it to take the engine out. If you run it underneath make sure the trunking or whatever you use is secured and not fowling items like gear selector or steering bits. For simple vehicles the front underneath is a cluttered mess. You can then route it under the front belly pan and into the cab where all the other wires go.
Thanks for the picture it really helps. I was thinking about above the fuel hose, but near the cable looks like a better place. My van has a redundant connector (FI?) in addition to the other cables so there is no room to feed another cable through the grommet. The cable is 7 core and it is inside 9.5mm OD conduit
Here's a picture of the left & right-hand sides of my engine bay, with extra holes for cables and hoses: Several years ago, whilst I had the fuel tank removed, I also modified the removable, sheet-steel, fuel-tank compartment bulkhead (i.e. firewall in USA parlance), by welding onto the back of the seven ribs, a total of nineteen M6 nuts (two each on the two outboard ribs and three nuts each on the remaining five), to facilatate the later fitment of various components and accessories, such as an electonic-ignition control module and parts of a Bosch D-Jetronic or L-Jetronic, electronic fuel-injection system. With the benefit of hindsight, it might have been better, to have fitted about five M5 nuts (in preference to the larger M6 nuts), to each of the seven ribs, to provided greater choice with regard to brackets and mounting.
