Today I installed a new Walbro 400lph fuel pump, replacing my Walbro 255lph fuel pump.
This is a 30 minute upgrade if you know what you’re doing. It can take longer if you’re unfamiliar with the S14 fuel system. There are a few things to point out about my Walbro 400 fuel pump that cause me a slight delay:
- The plugs it came with do not match up to anything. It’s almost like I had a kit for another vehicle. Just clip the plug and crimp or solder the wires to the connector on the S14.
- The rubber isolator does not match up with the Walbro 400 bottom. You have to kind of cram it into place with the bracket. The 255lph fit like a glove, so this is unfortunate that the over-sized base made the isolator a funky fit.
- The S14 fuel sock/filter is a tight fit on the 400 but fit perfectly on the 255. You need to use a hammer and a small screwdriver and lightly tap it into place.
- Pay attention to the + and – symbols on the fuel pump. My 255 was wired backwards. The black was + and the – was red wire. I followed the wire colors instead of the terminal symbols and wired it backwards the first time, which wasted a lot of my time.