I'm trying to figure out something that I read on here some time ago. That is the banjo bolt on top the fuel filter is how air gets bled from the fuel system. If this bolt is plugged (for WVO use) how does this eliminate the air bleed mechanism? Doesn't the air in the system just go around the bolt and right to the tank with the fuel?

All I can figure is the fuel would normally drop into the filter and get looped back into the IP. This would lessen the amount of fuel that needs to be drawn from the tank. (I guess the air goes back to the tank or builds up in the top of the filter...I haven't gotten that far.) But it looks like the load on the IP is decreased with an active banjo bolt.

With a blocked banjo bolt, all of the diesel is returned to the tank, none drops into the filter, and carries the air with it. But a lot more fuel is pumped. Is this bad? If you run primarily on WVO that is looped, the load on the IP should be the same as it was originally with an unblocked banjo bolt.

Am I missing something?

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1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now