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Old 11-23-2009, 07:49 PM
Brian Carlton Brian Carlton is offline
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Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by MercFan View Post
Ok - now that I'm all done with the tank cleaning and hose replacement process I need to slightly modify the steps for restarting the car knowing I've got some air in the fuel lines....

I've replaced both main (clear) filter and the spin-on filter with brand new ones. I filled the spin-on with PowerService to the brim and then I snugged the bolt on top - should be good and full, but the clear filter has plenty of air in it, so here's the steps I'm planning to follow. Note that the car's rear end is still elevated high on the ramps, which should help somewhat with gravity-fed fuel flow from the tank:

1) Press the STOP lever and wire it in place temporarily so I don't fuel feeding into the cylinders.

2) Disconnect the glow plug relay

3) Fill the tank with clean diesel (I plan on putting about 10 gallons in)

4) Loosen one of the Banjo bolts on the filter to allow the air to escape out of the top. Put some rags there to avoid fuel spillage.

5) Disconnect the return line and use some type of pump (bicycle pump or the Mighty Vac pump) to produce slight pressure in the tank thus forcing the fuel thorught the clear filter, lift pump, spin on filter and out through the gap I create by loosening up the banjo bolt on the spin-on...

6) Pedal to the floor and start cranking in 10 second intervals with 5 second brakes in between and hope it starts eventually...

The things that I'll have working against me will be:
a) The car will be cold since it has not been running for a week
b) The battery may not be the freshest - I may hook up a battery charger accross it for extra starting power.

Anything I'm forgetting that I should do (like pray... )

James
Firstly, I don't believe you can pressurize the tank and force fuel back toward the primary filter. The tank is vented to atmosphere.

Secondly, I don't believe you need to bother with all of the above. If the secondary is full, the engine will immediately start............might hesitate a bit and possibly stall once.

If the tank has about 10 gallons in it, the fuel level is higher than the primary and the system will self prime right to the fuel pump. The fact that you see air in the primary is irrelevant. That bit of air will go right on through the secondary and out the return line.

Just start it and mash your foot if it begins to falter. It'll run.
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