SW 240A Fuel Pumps

[mickmate]

David interesting to note your drawing shows a street tank albeit with a cell flange on top. That also shows a single line to the front as in street cars.
Hey Ron shall we sing together in two part harmony ;-)

[computerworks]

Originally Posted by mickmate

Hey Ron shall we sing together in two part harmony ;-)

Always....

[Dominik]

Interesting reading...

I am still "baffled" by having a reserve amount in a racing tank.
Was the amount of reserve designed to last one lap? For which track?

42 gal last for (I am guessing) 2 hours of racing? I can understand that calculating the amount of laps from that differ quite a lot. That answers above question.

Are there now two SW pumps for the reserve? Why not only one, if it had to last one lap only? I suppose one or two pumps don't add much to the weight of a 42 gal tank full of fuel...

Which reminds me, I have two of those unused since years (from new?) somewhere in my garage!

[FatBoy]

Originally Posted by Dominik

I am still "baffled" by having a reserve amount in a racing tank.

You and me both, but the evidence does seem to point that way.

I had another pair of pumps that I cleaned and polished and I've now fitted those to match the polished body:



Paul

[FatBoy]

I've eventually got my pumps all correctly plumbed in and working and I ran them for the first time today in the car with fuel.
Can someone with experience of these pumps confirm whether mine are working as they should please? When I first switched them on (from dry) they ran fast and noisy but once fuel was going through them they were much quieter. That bit I'm happy about, but as they ran up to pressure, they slowed down considerably until they were slowly ticking together. Is that how they should be?
They're running at 7psi at the moment, which is probably a little high, I was thinking that 5psi would be better. Does anyone disagree?
Incidentally, they sound much better than the horrid buzz that the Holley pump made.

Thanks.

Paul

[601HP]

Yours are running as designed. Once line pressure is reached, the pump pulses very slowly. When I test one of my rebuilt pumps, its connected to a flow valve and pressure gauge. With the valve wide open, the pump races. As I dial back the flow by closing down the valve which simulates increased line pressure, the pump slows waayy down! It may pulse once every 0.5 to 1 second.

I'd dial the pressure back to between 5 and 6 psi.

David

[FatBoy]

Hi David,

Thank you for confirming that. I'm please with the end result and now knowing that they are running as they are supposed to is all I needed.

I think I got my rebuild kits from the same place as you. I haven't figured out what the O-rings are for though that came in the rebuild kit.

Paul