Engine/Transmission (1994 - 1998) Haisleys aux. fuel system

[AKron]

Does anyone have any experience with it? How much power did it add?

 

[JTEdieselram]

Have not had experence with that piticular setup, but an auxilery pump won't add any power. It will only keep fuel at the injection pump if you are making big #'s I did not have to switch from my stock lift pump until I was making over 450hp. If you are looking for performance gains you may want to look into a fass system because this will provide the extra fuel flow and rid the fuel of air bubbles. Air in the fuel acts like retarted timing. If you want to go the cheap route, buy a holley red, or black electric fuel pump and install that in place of the lift pump (holley pump cost about $100), these actually work really well. Mine has been on my truck for over two years (close to 100k miles) with no issues. Hope this helps,

 

[ALehman]

Will a Holley pump also remove air or does it just act as an extra pump?

 

[JTEdieselram]

No air removal, just adds fuel volume. The fass system is pretty complex (has two seperate pumps and two large micron filters to remove bubbles. I saw the display at sema, really nice unit, you get what you pay for. I run the holley for now, but I do want to upgrade someday. I don't think you would really notice a difference until your truck is really hopped up. This is strictly my opinion

 

[Timebomb]

It just acts as aux pump and dosnt remove air. With a good lift pump and overflow valve you can make some good numbers.

 

[Bob4x4]

Air is not an issue on the 12v... ... ... ... . unless you have leaks



Bob

 

[zstroken]

I know some guys who have run it. It isn't a bad sytem. When the developed it there weren't too many options. I like the FASS unit personally. It could add some power if your starving your injection pump.

 

[ALehman]

Which pump would be better, a holley pump or a Glacier pump or maybe someother pump for a heavily fueled 12 valve? I still plan on running my engine driven lift pump and factory filter. What would be the part numbers also?

 

[zstroken]

I would use the glacier pump. I have heard nothing but great things about it.

 

[bgilbert]

Here are some of my fuel system pics in my gallery: https://www.turbodieselregister.com/user_gallery/displayalbum.php?&albumid=18647.



This should give you some ideas. Whatever type of supply pump you choose, you should consider upgrading the pickup in the tank to 1/2" and same 1/2" to the fuel supply to the pump. You can also order just the 1/2" pickup tube that Haisley sells or build your own.

 

[Signal73]

what are the 12 Valve stock systems (stock pickup, lines, lift pump, filter setup) typically good for HP wise before needing to upgrade?

 

[zstroken]

Well if you talk to Joe Donnelly he did 800 HP with a stocker. I think you can get away with that on the dyno, it is such a quick shot even if you pull the pressure down, your not starving the pump. For sled pulling I think you would benefit from an aftermarket pump. I run one for increased pressure, and saftey. The pump is tied into the kill switch on the back of the truck.