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

[FireSale]

Current wish list.

-10 braided line
MagnaFuel filter
MagnaFuel Quick Star 275 pump
MagnaFuel regulator
Holley pressure gauge
Summit 15 gal aluminum fuel cell and straps
AN hose cutters and Koul AN installation tool for -10

Total damages: $1,044

The pump maxes out at 18psi which is twice what a carb motor needs. It's rated to feed up to 700 hp and I hope for around 500. It's also been used on the street, so I wouldn't worry about burning it out driving to the strip this year towing a small trailer.

There seem to be two return systems, one from the pump and one from the carb feed. One is a closed pressurized line at the carb and the other is a loop back to the tank. Most big pumps return from the pump. Any preferences here?

Thanks for all the feedback and well thought out PMs.

Dale

[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