How to Prime S60 12.7

I blew shop air in the fuel tanks

 

Yup.

 

For next time - at least on mine, there’s a 90 degree shut off valve at the primary filter at the front of the engine, drivers side. I shut it off before changing filters.

And remember to turn it after replacing filters.

If your filter housing don’t have one - install it, or you’ll be doing the same dance again.

There’s an air rig that will prime it, but like said, pressurize the tank with air to prime should work too.

 

Never could wrap my head around how blowing air in the tanks could actually work. Your fuel system is essentially a loop - line from tank to the pump and then the head, line back to the tank.

Pascal's law says that pressure applied to an enclosed fluid will be transmitted equally in all directions at every point. Pressurizing the fuel tank would give you an exactly equal backpressure up the return line. Would those two pressure not just cancel each other out and put you back to square one?

Personally I have never had success trying it.

 

I don't really like ether, and have never really used air myself. Most fuel systems have a check valve in the return, so there's that.

60's just start so dang easy though. I mean, even ones i've built don't get over two cranking sessions before starting.

No matter, shouldn't have taken 2 cans of ether either. Probably sucking air somewhere

 

I hate ether too, I'll only use it if its winter and the engine's making smoke. 90% of what I work on have glow plugs or a grid heater so ether's a no-no anyways.

I'd be curious as to how the check valves affect the system when you pressure it up with air. I would think that the back pressure on them would keep the fuel from flowing but who knows?

 

Not sure since they're meant to stop fuel returning from the head. I think a 60 check valve closes at 3psi.

And you'd have to plug tank vents

 

Crack an injector line off, air gets your fuel to the top end without any bubbles getting stuck. Thats what we’ve always done anyway. Fuel starts coming out the injector line, crank it tight, and she’ll fire.