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Tired Fuel Pump?


Mjit
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Hi,

Was away in my Spitfire over the bank holiday and had an intermittet missfire at low (sub 3k) RPM for the first part of the journey.  This continued until I stopped for fuel and filled the tank.  After that it ran perfectly, as it did at the start of the return journey.  After a while the intermitten missfire came back...until I refilled again.

 

My current thinking is the fuel pump's getting past it's best.  Full tank it's fine as there's a head of fuel forcing its way to the carbs and at higher RPM the pumps making enough pressure to keep up with demand.  At low RPM and a lower tank it's struggling to cope though.

 

Not had a chance to check things out yet but does that sound plausable?

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Having messed around with my fuel line I don't think there's a lot of difference in pressure between a nearly empty or full tank. Its mainly down to the pump pulling the fuel from the tank. I would check your tank is vented properly if the air can't get in the pump is going to have a problem with an increasing vacuum in the tank. So as you say, on a long run getting towards an empty tank the pump will struggle.

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