Part of my plan is to replace the fuel pump. Unfortunately, the 320’s E-1 engine fuel pump is no longer available from Nissan and as far as I can tell, not really available in the aftermarket anymore either. I did some research and found that the J-series fuel pumps should fit the E-series motor in the 320s, but haven’t been able to chase down one of those yet either. I’m pretty sure the fuel pump on my engine now is a J-series engine pump.
I’d really rather stick with a mechanical fuel pump if at all possible. Rebuilding is an option, but I haven’t had any luck finding a rebuild kit. They are probably out there.
Mike Klotz, in a couple of posts on the Ratsun forums, discovered that the four cylinder Datsun L-series engine, found in 510s and the later 521 trucks has the exact same footprint as the 320 and 520 fuel pump. Since those vehicles are much more common than the 320 trucks the aftermarket parts support should be considerably higher. However, the L-series fuel pump is not a direct swap for the J-series, as the arm on the L-pump is much longer than the J-pump. Mike’s idea was to transplant the arm from the J-pump over to the new L-pump and install the new one. It should work and is something I plan to attempt if I can’t find a new J-series pump.
Here’s the fuel pump on my truck. It is a Nikki brand pump but I don’t believe it is the original OEM pump that came on the truck based on its appearance, but a later-style J-series engine fuel pump.