Originally Posted by Boko~maru
I have an extra lift pump inline near the diesel
fuel tank with both constant & momentary toggle switches at my fuel filter locations(Racor & spin on westerbeke) This allows me to change filters, drain water, ETC. In addition, the extra lift pump can be used as an emergency
back up, if the primary lift pump fails. the important stuff always seem to fail at a bad time!!! Anyway, this allows me to refill the new filters and avoid any "air in system" stumbles, hiccups, coughs. Works for me!
Interesting idea. But for the purposes of avoiding air in the lines, I don't see how it completely solves the problem...
If one allows the primary fuel filter to completely drain, this will in turn drain the inlet to the lift pump supplying the injectors. In other words, the fuel line going from the outlet of the primary fuel filter to the inlet of the lift pump will get drained and be full of air.
In my case, I turn the ignition key to run, which activates the lift pump which then sucks in air while the primary fuel filter is reprimed with fuel.
In your case, you will have refilled the primary fuel filter with fuel and presumably the fuel line between the primary fuel filter and the lift pump supplying the injectors. However, the air that is in the lines has to be released somewhere? I would think you could actually blow-out the diaphram on the lift pump supplying the injectors doing this???
I know I'm being anal here but bleeding on my diesel is a pain the rear...
I suspect some diesels are more prown to air embolism than others. I think air must get in to fuel lines quite frequently yet rarely does it seem to be a problem...