what is the correct fuel pump impeller orientation?

[roymil]

i've had my short pump apart to clean for a long time and after i've polished everything up and removed all of the faint scratches that made it obvious, I now cant be absolutely sure which way the impeller should be installed. 

Do the thicker sides of the blades go up, closer to the motor, or are they oriented down as I'm just guessing, toward the bottom cover?

thanks much, Mark

[Kevkeller]

Thicker side to the bottom I’m pretty sure.

[BaronYoungman]

Yes thicker side down

[BaronYoungman]

Imagine it like a airplane propeller you are forcing the gas up from the bottom of pump, thick part up to top of pump. You will also see they have a slight angle to them also increasing this action. ( pay no attention to dog nose in picture).

[Brandini]

To piggyback off of this conversation I have the early long style pump and I'm having difficulty installing the key for the impeller.

Does anyone have recommendations for installing this back in place?

I found this video starting at about the 9:30 mark where he discusses this but doesn't show how to do it.

https://www.youtube.com/watch?v=DQ70I8gfdlQ

[afibbe]

I like the dog nose. It is always good to have a second paw when you need it.

[geobarb11@comcast.net]

Put a small dab of grease or vaseline on the key to hold it in place while you replace the rotor. Just make sure the rotor has the thin side of the teeth facing the pump body