fuel pump and set up queries

[jrtuning_ben]

going to be running a swirl pot in my 200 but im confused:(

im looking at pumps and i cant work out which i need how much lph of pump am i going to need for 500hp? i thought the walbro was 255lph but all the expensive ones seem to be a lot less than that.

also i need lifter pumps for my pot as apparently if i use my in tank walbro for that itll break as such which lifter pumps would be best and they seem to be half the flow of the high pressure pumps so do i need two?

also what else am i going to be needing to run this kind of set up?

cheers guys

[rob@vems.co.uk]

The only swirl pot I've used was gravity fed, then the high pressure pump was an 044.

As I understand it you want a high volume low pressure pump to feed the swirl pot and something like the Bosch 044 to feed the fuel lines.

[damo_S13]

me and ben have got this setup sorted between us we found out this is a very good setup.

just incase any ones elss wants to know. i think me and ben have got it sorted now

from stock tank via filters to 2 x facet red top pumps to swirl pot

swirl pot to stock tank

swirl pot to 044 inline pump then to fuel rail

fuel rail back to swirl pot

but looking on the MLR website most of the 600hp evos are runnning a 255 welbro as the lifter pump and then the 044 to the fuel rail this is what im going to try

[rob@vems.co.uk]

Have you seen the fuel setup in Matt's thread:
http://www.vems.co.uk/forum/index.php?topic=70.0

[Volvo850r]

Is your car a NA or turbo? - im guessing turbo.

This will determine your fuel pump needs as on a turbo car the pump has to work at higher pressures (fuel pressure regulator base pressure + boost) and provide more fuel for cooling.

On a turbo car the walbro 255lph HP (make sure you get the HP version for turbo cars) is good for about 500bhp.

More than that then you want an intank pump that has high flow at low pressure, feeding a swirl pot - then with 1 or 2 044's feeding the fuel rail.

Here is a page with some good info on fuel pumps:

http://www.stealth316.com/2-fuelpumpguide.htm

[cliffb75]

going to be running a swirl pot in my 200 but im confused:(

im looking at pumps and i cant work out which i need how much lph of pump am i going to need for 500hp? i thought the walbro was 255lph but all the expensive ones seem to be a lot less than that.

also i need lifter pumps for my pot as apparently if i use my in tank walbro for that itll break as such which lifter pumps would be best and they seem to be half the flow of the high pressure pumps so do i need two?

also what else am i going to be needing to run this kind of set up?

cheers guys

Hopefully, I've already answered your question here:

http://www.vems.co.uk/forum/index.php?topic=97.0

Scroll down to post 5 - Fuel supply and hardware. I've walked through a calculation example so that you can estimate your required flow given your expected engine airflow and lambda requirement.

If you are using the standard tank, I don't see a problem with running the existing in tank walbro as the lift pump, since it has a small built in collector in the pump / level module. Even with an aftermarket tank, it shouldn't be too much of an issue to use an injection pump to supply the swirl tank, as long as you have the pickup centrally located and don't run the pump dry for extended periods.

As mentioned in the link posted by Volvo850r, don't forget the electrical supply required for the pumps - voltage drop to big pumps running high pressures is a surprisingly common cause of engine damage due to to the engine running lean, since the pump isn't capable of supplying enough fuel at 6 volts or whatever.