AN-6 or -8 for My Fuel System (SBF)

[HandOverFist]

Ours has -10 from tank to regulator and -8 from there to carb. Using a BG 280 pump it shows 14psi on the high side then goes thru a big body Holley regulator which is set to 6-1/2psi. I have not seen it drop pressure down track as of yet. Recently added a gauge on the cowl to confirm this...who knows if it is really accurate/responsive enough to show tho.

[FireSale]

Originally Posted by HandOverFist

Ours has -10 from tank to regulator and -8 from there to carb. Using a BG 280 pump it shows 14psi on the high side then goes thru a big body Holley regulator which is set to 6-1/2psi. I have not seen it drop pressure down track as of yet. Recently added a gauge on the cowl to confirm this...who knows if it is really accurate/responsive enough to show tho.

Thanks for the input. I really hope you can keep your rig up and running for the season and beyond. Reading your build thread has been painful.

Dale

[V M Kauffman]

You need 7.5 lb of pressure to move the column of fuel for each G of acceleration this is just to move fuel forward if the fuel cell is in the rear

Originally Posted by FireSail

Thanks for the input. I really hope you can keep your rig up and running for the season and beyond. Reading your build thread has been painful.

Dale

[FireSale]

Originally Posted by V M Kauffman

You need 7.5 lb of pressure to move the column of fuel for each G of acceleration this is just to move fuel forward if the fuel cell is in the rear

I read that too. Lateral acceleration doesn't translate well into G forces which are a pull against gravity. A Top Fuel car will pull something like 4 G so a 10,000 hp engine would need something like a 40 psi pump.

If the line was empty at launch, then there would be a force working against the pump, but since the system is fully pressurized I don't think this is that much of an issue. The force of launch could actually aide the pump. The fuel would be pushed to the back of the tank and out the exit line towards the pump forcing fuel into the system.

Dale