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MG MGB Technical - Malpassi Fuel Filter

Just fitted one of those glass "filter king" combined filter/regulators (for no other reason that they look cool and I'd always fancied one). Sort of expected it to fill with fuel when I turned the pump on, but it hasn't, just the bottom half inch or so. Engine runs, so it's getting through. Is this right ? or do I have to start working out how the regulator part works ?
Andy

Not filling with fuel seems to be a common problem with clear filters, probably all filters. I use metal can type filters so I don't know they fill. Don't worry about it unless you have some fuel associated problems.

FWIW, Clifton
Clifton Gordon

I've got the same filter and have adjusted it to max pressure(I think?) and it fills up to 1/4" from the top of the visible glass bowl. I don't know if it'll fill less if adjusted for less pressure.
N.C. Nielsen

It's normal.

I use the stock plastic see-thru filters (and I've
used the glass ones in the past) and they
never fill up completely with fuel.

I think it's because the filters are positioned
horizontally and, as such, there's an air pocket that
always remains and cannot bleed out completely.
However, if the filter were mounted vertically, then
I think you'd get the filter to fill completely - but it
seems quite a hassle to go through for something
that'll have little advantage.
Daniel Wong

Dan is right. I have two of the glass units on my GT, the one from the tank is mounted vertically to accomodate the fuel pump and never seems to have a bubble, and the horizontal one on the firewall for the carbs always does. FYI
Bob Muenchausen

Have had a verticaql plastic filter in the "C", it is not always filled. Use a metal or glass filter, the plastic will eventually crack where the air bubble is.
John H

Hi Andy
I fitted one earlier this year to cure a carb overflowing problem caused by the electronic pump, initially it only filled the bottom 1/2" or so but after a bit of running it now runs nearly full, neither level seemed to affect the running of the car.
Ron
R. Algie

I put on a glass filter when I was having fuel tank
rust problems. After quite a few miles of driving, the glass filter was nice and clean, but when I checked the carb float bowl, there was tank rust sediment in the bowl. Bowl was cleaned before glass filter was installed. I took it off- which was the plan anyway because I don't like glass filters(in case of a crash). I installed a small metal filter and got no rust in the carb after that. I have since replaced the fuel tank and now I
use a huge Ford metal EFI filter- probably overkill.
Regards, Jack 1980 MGB V8
John Renaud

This thread was discussed between 15/04/2006 and 21/04/2006

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