[Spridgets] Fuel pump

Michael MacLean rrengineer.mike at att.net
Sun Jan 10 20:58:33 MST 2021


I had a fuel feed problem with my Bugeye in the recent past.  I am solving that with a new fuel pump.  Now to the MG.  The fuel pump running furiously like the tank is empty never happened when I got the car 7 months ago.  It is a recent development.   I really need to get under the car and look around.  I'm just whistling in the wind at this point.  In the next few days I'll get the car up on my hydraulic scissor jacks and start the inspection.  I will let everyone know what I find.  Some on the MG Experience said that it sounded like classic vapor lock.  Maybe while sitting in one spot the fuel line becomes heat soaked.  I have no idea the proximity of the fuel lines to the exhaust system with this car.  Mike M

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  On Sun, Jan 10, 2021 at 5:03 PM, Kevin Valentine<kevinv1275 at gmail.com> wrote:   Mike,
I had a Triumph Herald that acted like you describe. 
It would occasionally suck air thru a pinhole in the fuel line between the tank and the pump.   It was a metal fuel line that was rusted just enough for a pinhole to form.  The pinhole was at a point in the line that was above the fuel tank, so it did not leak fuel.   The  pump was mechanical and would not re-prime itself.  I would  blow into the fuel filler until I pushed enough fuel to the front of the car to prime the pump and restart the engine.......  I was 16 years old and knew nothing about British cars......  (Still don't).
I had another British car that would occasionally act the same way.  It turned out,  the vented fuel cap had been blocked with rust and the car would stop running after a short drive if the tank was near full.  It took me a while to find the problem, but the best hint was, the more fuel that was in the tank the shorter the distance the car would travel before stopping.  The more air that was in the tank, the longer it took for the fuel to stop flowing.
How often does it act like this?   I seem to remember you having a problem like this a short time ago????
KevinTuscarora, Pa  
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