twin fuel pump conversion - Page 5

**Mike R** · 10-04-2013, 05:00 PM

Surely it would be better to find a pump that flows the same (or just fractionally better) as the OE item, to avoid having to remap the car?

Does anyone have the flow info of the stand pump or the make and part number of it?

**cantfind1** · 12-04-2013, 12:14 AM

There is one more option I have been considering trying.

That is to take the fuel return line from the left side of the tank and run it to the right side instead. Through the top of the pump.

So this means that any return fuel would be placed in the side with the pump if by any chance the right side started to fill up it would just flow across the bridge to the left side anyway.....

If anyone can see any downsides to this then let me know, but I have been thinking about this recently and may solve the problem of the right side of the tank running low while the left side still has more fuel in it.....

It would only involve a bit of fuel hose some connectors and a couple of clamps....and is also reversible if it doesn t work....

**Mike R** · 12-04-2013, 08:16 AM

Quote:

Originally Posted by cantfind1

There is one more option I have been considering trying.

That is to take the fuel return line from the left side of the tank and run it to the right side instead. Through the top of the pump.

So this means that any return fuel would be placed in the side with the pump if by any chance the right side started to fill up it would just flow across the bridge to the left side anyway.....

If anyone can see any downsides to this then let me know, but I have been thinking about this recently and may solve the problem of the right side of the tank running low while the left side still has more fuel in it.....

It would only involve a bit of fuel hose some connectors and a couple of clamps....and is also reversible if it doesn t work....

Sounds logical to me - the proof is in the pudding - keep us posted

.

**shimmy** · 12-04-2013, 12:00 PM

You the are just FIDDLERS

**cantfind1** · 12-04-2013, 01:03 PM

Thats rich coming from you!

Kev Ush · 13-04-2013, 02:55 PM

Hi folks! Sorry for jumping in on your thread. I'm not really much of poster, I'm just more of a lurker in the backround (reading through all your tech threads and keeping an eye on your for sale section

) but this thread has caught my attention. I'm building an M3 trackcar and although I haven't tracked it yet (so I don't know if I'll be going quick enough to get fuel stavation issues) I'd like to do something that would help just incase.

I was having a think about all the options that people have listed and I'll apologise now if I'm stating the obvious. Feel free to correct me if I'm wrong.

Single Pump, Twin Pick up Option: Surely this would be no better if not worse than a single pump with a single pick up? I would imagine that as soon as one pick up starts sucking air the pump would loose prime completely and you'd be back to square one...This would be an issue on both left and right hand turns now.

Twin Pump, Twin Return Option: Seems to me like it could work well. You'd just need to sort the fuel pressure out. My only concern would be if you're low on fuel and cornering hard you might end up with one pump loosing prime more than the other and it would end up overheating and siezing up???

Single pump with return line relocated to the same side as the pump : Seems like the best option to me. Its also the cheapest. You'd just need to come up with a way to keep the fuel around the pumps pick up.

Kev.

10-04-2013, 05:00 PM	#41
Mike R S6, Sport On, Traction Off Join Date: Dec 2010 Location: Norwich Posts: 1,582 Casino cash: $17558	Surely it would be better to find a pump that flows the same (or just fractionally better) as the OE item, to avoid having to remap the car? Does anyone have the flow info of the stand pump or the make and part number of it? __________________ Mike R Sarcasm is just a free service I provide. Nordschleife, there's only two barriers to worry about - the ones on the left and the ones on the right . CSL number 044

12-04-2013, 12:00 PM	#44
shimmy CSL Register Uber-poster! Join Date: Apr 2008 Location: Uk Posts: 14,646 Casino cash: $43909	You the are just FIDDLERS __________________ .

12-04-2013, 12:14 AM	#42
cantfind1 S5, Sport Off, DSC M-track Join Date: Oct 2009 Location: Sydney Australia Posts: 675 Casino cash: $6490	There is one more option I have been considering trying. That is to take the fuel return line from the left side of the tank and run it to the right side instead. Through the top of the pump. So this means that any return fuel would be placed in the side with the pump if by any chance the right side started to fill up it would just flow across the bridge to the left side anyway..... If anyone can see any downsides to this then let me know, but I have been thinking about this recently and may solve the problem of the right side of the tank running low while the left side still has more fuel in it..... It would only involve a bit of fuel hose some connectors and a couple of clamps....and is also reversible if it doesn t work....

12-04-2013, 01:03 PM	#45
cantfind1 S5, Sport Off, DSC M-track Join Date: Oct 2009 Location: Sydney Australia Posts: 675 Casino cash: $6490	Thats rich coming from you!

13-04-2013, 02:55 PM	#46
Kev Ush Wonky 'L' after Washing Join Date: Feb 2013 Posts: 4 Casino cash: $497	Hi folks! Sorry for jumping in on your thread. I'm not really much of poster, I'm just more of a lurker in the backround (reading through all your tech threads and keeping an eye on your for sale section ) but this thread has caught my attention. I'm building an M3 trackcar and although I haven't tracked it yet (so I don't know if I'll be going quick enough to get fuel stavation issues) I'd like to do something that would help just incase. I was having a think about all the options that people have listed and I'll apologise now if I'm stating the obvious. Feel free to correct me if I'm wrong. Single Pump, Twin Pick up Option: Surely this would be no better if not worse than a single pump with a single pick up? I would imagine that as soon as one pick up starts sucking air the pump would loose prime completely and you'd be back to square one...This would be an issue on both left and right hand turns now. Twin Pump, Twin Return Option: Seems to me like it could work well. You'd just need to sort the fuel pressure out. My only concern would be if you're low on fuel and cornering hard you might end up with one pump loosing prime more than the other and it would end up overheating and siezing up??? Single pump with return line relocated to the same side as the pump : Seems like the best option to me. Its also the cheapest. You'd just need to come up with a way to keep the fuel around the pumps pick up. Kev.