Dave the tram Posted March 4, 2017 Report Share Posted March 4, 2017 I have a transparent fuel filter,between tank and pump, just before tthe pump. Should it have air in it. Sometimes it's full, sometimes part air, and occasionally empty but fills when running engine. Is this right? I'm assuming it's air, no reason for vapourisation as its not hot and near the bulkhead. If it's air, where does it come from? I wonder if I've got a leaky joint or a blockage so that it can't pull fuel through fast enough. Any ideas? Dave Link to comment Share on other sites More sharing options...
Bordfunker Posted March 4, 2017 Report Share Posted March 4, 2017 Mine often has air in it, see pic below. I always assumed is was air drawn in from the carb as the fuel drained back towards the pump. Karl Link to comment Share on other sites More sharing options...
Darren Groves Posted March 5, 2017 Report Share Posted March 5, 2017 That's quite normal, nothing to worry about. Link to comment Share on other sites More sharing options...
Unkel Kunkel Posted March 5, 2017 Report Share Posted March 5, 2017 I have the exactlly the same sort if filter on car and also on 2 lawn mowers with gravity feed fuel lines. the appearance is the same as your pic re varying amount of filter that appears empty of fuel -and they are running ok On one unusually hot day last year mower conked out. Filter looked empty.1/2 hour later, fuel in filter -started fine. so ?? degree of vapourisation occurring - but dont know really. If it wasnt transparent you wouldnt know... Link to comment Share on other sites More sharing options...
SpitFire6 Posted March 5, 2017 Report Share Posted March 5, 2017 Hi, The gas you are seeing is probably not air. The gas is likely to be vapour. Not all gases are air. Cheers, Iain. 1 Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 5, 2017 Report Share Posted March 5, 2017 If its unwanted gases im told you can take tablets for it !!! 2 Link to comment Share on other sites More sharing options...
Robin Posted March 6, 2017 Report Share Posted March 6, 2017 Same thing happens to me - thought I was going mad as I couldn't work out how the fuel was getting through to the carbs as the fuel filter didn't seem full enough. Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 6, 2017 Report Share Posted March 6, 2017 The only way is mount the filter vertical so the air , gas, flatulence , exits up the pipe line and out through to the vent ... in the carb Link to comment Share on other sites More sharing options...
daverclasper Posted March 7, 2017 Report Share Posted March 7, 2017 Hi Wondering about this (mounted near vertical). Never really looked at filter after running, though it is only about 1/4 (max) full generally. Squirts what I thought is a healthy amount out of fuel line when cranking. Any advice great thanks. Cheers, Dave Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 7, 2017 Report Share Posted March 7, 2017 If you get any bubbles entering the filter then you are sucking air from a leaky joint or hose between filter and pump if there is just a void /air gap in the filter ,,, dont worry about it its fine your output to the carbs is a good squirt then all happy and smiling Think about your modern it has a solid metal canister filter , you cant see whats going on and hence cant worry about it pete Link to comment Share on other sites More sharing options...
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