Onan 4.0BFA-1R 16004C Fuel Pump Orientation
I recently bought an old (1984) honey of an RV. Most of my time has been spent straightening out the wiring as someone who didn't know much about electricity thought possessing a screwdriver and a mon...
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I bought a BFA used, same complete Model and Spec as yours, and soon realized the fuel pump was in trouble. I remember tinkering with it and replaced with a "Mr. Gasket" type from the local auto supply. It was actually a Purolator, which is now Facet-Purolator. Store had "low" and "high" pressure versions of the pumps and the "low" fit into the pressure range specified by ONAN. I failed to realize that ONAN wants a pump that serves as a shutoff (gas can't be pulled or pushed through) when not running. The Purolator model I bought turned out to not be of that type, but it was never an issue.
The Parts Manual shows the Pump as I remembered it, with the twist-off cap at the top. I have a set of manuals for BFA so PM me with your email and I can scan some pages for you. Let me know if/what you need.
Our carburetor was varnished up, and I couldn't clean it up with repeated attempts. Luckily there was "still" a carburetor rebuilder willing to do other than automotive. It ran better after that but the RPM still "hunted." Replaced the Governor Spring and that solved it. Best couple dollars I ever spent on a project! Service manual lists the Spring several steps down in the troubleshooting for "hunting" but wife suggested I just get one instead of tearing the governor apart and what all else. That BFA is a genuine Power Plant, not the glorified mower engine the newer ones are.
The Parts Manual shows the Pump as I remembered it, with the twist-off cap at the top. I have a set of manuals for BFA so PM me with your email and I can scan some pages for you. Let me know if/what you need.
Our carburetor was varnished up, and I couldn't clean it up with repeated attempts. Luckily there was "still" a carburetor rebuilder willing to do other than automotive. It ran better after that but the RPM still "hunted." Replaced the Governor Spring and that solved it. Best couple dollars I ever spent on a project! Service manual lists the Spring several steps down in the troubleshooting for "hunting" but wife suggested I just get one instead of tearing the governor apart and what all else. That BFA is a genuine Power Plant, not the glorified mower engine the newer ones are.
