Bleeding a Roosamaster

[WilBury]

Installing refurbished Roosamaster DB fuel pump & the inlet is very close to the same level as the top of my fuel tank. It bled fine thru the filters but not enough to get into the pump.
I have a breather fitting on the tank. Can I put some air pressure to it to prime the system all the way to the injectors? Any bleed screw on the pump? Any danger here? Must the pump be turned?

 

[Dieseltech]

The pump has NO bleed screws, and it MUST be turning to supply injectors with fuel. Pressurizing the tank only gets fuel to the pump, not the injectors.

 

[WilBury]

Okiedokie. 10-15 lbs pressure should be safe, no? No way to tell if vane pump is full before cranking or does it begin to return to tank?

 

[Jim.ME]

(quoted from post at 08:33:15 10/17/22) Okiedokie. 10-15 lbs pressure should be safe, no? No way to tell if vane pump is full before cranking or does it begin to return to tank?

10-15 pounds could blow a tank up, 2-3 pounds should be enough if you do that. Crack the inlet line at the pump and see if it has fuel there. If it does, tighten it, then crack the high-pressure lines loose at the injector fittings. Set the fuel in the run position and crank the engine to get fuel out the high-pressure lines at the loose fittings. Tighten the lines as fuel appears.

 

[WilBury]

:shock: 2-3 lbs, OK
Set fuel levers in run? Whaddya mean?? Just kidding, lol.
So I won't see return fuel just from the vane pump?

 

[Dieseltech]

Return fuel out the pump top takes awhile, and you don't need to see return fuel before engine will start. I've seen engines run two to five minutes BEFORE any
pump return oil shows up.

 

[WilBury]

Perfect, just what I needed to know. Thanks Rich!