Problems fitting ancillary fuel filter (diesel)

Because biodiesel and related fuels are more viscous than ordinary diesel, it tends to pick up dirt from the bottom of the fuel tank. For this reason, I have been advised to fit an ancillary fuel filter with a transparent casing before the main filter so that dirt can be seen before it builds up too much.

However, I am having difficulty in fitting the filter. When I have fitted it to the fuel tank end of the fuel line, I suck on it to fill the filter with fuel and then attach it to the engine side of the fuel line.

But when I suck on the filter, it is difficult to get all the air out and then when I attach the filter to the engine side of the fuel line, a lot of air always gets in so that, in the end, the ancillary filter is half full of air.

Can anyone explain how to avoid these problems? There must be a bullet-proof technique for fitting the ancillary filter without getting air into the filter and into the fuel line.

Many thanks,

Gerry

Reply to
Gerry
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bullet-proof

What sort of filter are you fitting?

If it is one of those plastic things, that people usually put on petrol cars, then they nearly always have air in them, but I wouldn't worry about it too much, the air bubble will happily sit in the filter, the fuel will flow past it, or if you mount the filter vertically, the air should flow away when you bleed the system.

Ideally, you should fit a glass bowl type sediment trap, they are designed to do exactly what you want, and you simply remove the bowl and empty the gunk out when you can see it. Any diesel injection specialist should be able to supply one.

Reply to
SimonJ

Many thanks. That's very helpful.

Gerry

Reply to
Gerry

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