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Old 10-28-2005, 04:08 PM
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Pumping air out of fuel...my method works, but is it wrong?

1982 300D

Normally, when I change the fuel filter, or something like that that can introduce air into the line, I just pump the hand pump until I see fuel in the pre-filter (maybe a couple of extra pumps), and then I can start the car right up.

However, I remember reading in my Hayne's manual that you should loosen the banjo-bolt on top of the fuel filter and pump until you see fuel spilling out from that bolt. I haven't done that since the first time when it only took one or two pumps to make the fuel bleed from the bolt and the engine started right up.

So, my question is, is their anything wrong with not bleeding the fuel through the banjo-bolt on top of the fuel filter and instead just pumping the fuel until I see it in the pre-filter while the banjo-bolt is tight? Am I damaging the system due to pressure build up, and is that why you want that bolt loose?

Thanks,

Pete.

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Old 10-28-2005, 04:14 PM
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not damaging anything but after the prefilter is filled it goes through the primer pump and then into the large, sconndary spin on filter. Leaving the bolt a little loose just fills the system better, so a few cranks after and the engine should start, rather than using the starter to run the fuel pump to fill the spin on.
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Old 10-28-2005, 04:16 PM
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So far, (4 fuel filter changes), I've only had to crank it once after pumping the fuel with the banjo-bolt tight, and have had smooth starts.

Maybe I've been lucky so far with air.

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