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BL was very kind to post the following instruction to replace fuel filter for my 1990 740 GL with REgina system ie in tank pump with only the fuel filter on the outside under neath the driver's seat.One last question before proceeding:
The banjo fitting at the filter outlet(front of car side)seems easy to disconnect.
What about the filter inlet(rear of car),there is no banjo fitting but I have a about 7 " rubber hose with fittings at filter end(27mm casted nut side) and steel fuel line side.Are they the mentioned NPT fittings
Do I disconnect at the steel line/rubber hose junction fitting?Thanks.That will be easiest so that I can take the whole thing off and work on a bench as I have 18mm,19mm,22mm wrenches but no 27mm wrench.Please advise and confirm.Thanks
Tom
It isn't that much work although if you get rough with the thing you can puncture it as the filter metal is quite thin. Relieve your fuel pressure by removing ( I think) fuse # 1 and crank the engine If it starts, wait til it dies and your pressure is relieved. I leave it in the holder under the car as it is a little easier to manage, just loosen it a bit. You need two wrenches, one to hold the casted "nut" on the filter (22 mm maybe ?) and the other to loosen the banjo fitting on the front of the filter. Have a coffee can and rag handy to catch the fuel that runs from the filter. Make sure, as above, you have a good bite on the fittings with your wrenches as if you slip off, you can puncture the thing. The old one is no big deal but you don't want to rupture your new one which leaves you to walk to the dealer to get a new one :). Slide it back a bit in it's holder and loosen the rear fitting which may be a banjo or a NPT adapter to the fuel line. If you have the NPT fitting, take it to the bench to remove it from the filter and reinsert it in the new filter. Note the flow direction and don't hook it up backwards. Just reinsert the fuel lines and your're done. Reinsert the fuse and crank it which may take 20 seconds +/- to recharge the system.
bl .
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