Suddenly won't start after recent tandem pump change

Still a bit lumpy on the first turn of the key, that makes me think that there is still a bit of fuel run back.
Its a bit like an old petrol carb where there is just enough fuel in the pot to feed the cylinders but only a couple of them until fresh fuel eventually feeds all four cylinders and then the engine runs sweet.
 
johnyfartbox said:
Still a bit lumpy on the first turn of the key, that makes me think that there is still a bit of fuel run back.
Its a bit like an old petrol carb where there is just enough fuel in the pot to feed the cylinders but only a couple of them until fresh fuel eventually feeds all four cylinders and then the engine runs sweet.
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That does sound like a little air is still getting in but the engine is starting and the tandem pump is bleeding it out before it stops the engine. I'd wager if you had a clear pipe on the return you would still see air bled out initially. You might find the warmer weather is helping with a bit less viscosity in the fuel.
 
TAABVW said:
That does sound like a little air is still getting in but the engine is starting and the tandem pump is bleeding it out before it stops the engine. I'd wager if you had a clear pipe on the return you would still see air bled out initially. You might find the warmer weather is helping with a bit less viscosity in the fuel.
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The warmer the fuel, the bigger the bubbles. Not more air, just bigger bubbles, as air expands quite a bit as it gets warmer.
Mac.
 
TAABVW said:
I was more thinking: the less viscous the fuel the easier it is to move hence less suction to draw air into what is likely a really tiny leak.
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That too.
We think of gaskets keeping stuff in, but on the suction/vacuum side, it's keeping stuff, (air), out!
Here the same gasket has to do both jobs, in different spots along it's path. Changes from one to the other over a couple of millimeters.
Mac.
 
PlasticMac said:
That too.
We think of gaskets keeping stuff in, but on the suction/vacuum side, it's keeping stuff, (air), out!
Here the same gasket has to do both jobs, in different spots along it's path. Changes from one to the other over a couple of millimeters.
Mac.
Click to expand...
There must be two points, where the gasket is doing both
Edit: I think I'm wrong about that. The gasket on the vacuum side is just that.
Mac.
 
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