Fuel pump flow question
Thread Starter
Joined: Jan 2009
Posts: 1,106
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From: Lebanon
Cls63 & C32
Fuel pump flow question
Let's say that the stock in tank fuel pump flow x at 70 psi, if we add an in line fuel pump that flow 2x at 70 psi after the stock one, so the stock pump push the fuel to the added in line one, the question is the added one can still push 2x at same pressure?
Thanks.
Thanks.
Super Member
Joined: Apr 2009
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From: Tacoma WA
Bicycle
If you add a fuel pump "in line" your bypassing the factory in tank fuel regulator. There's no way to control the the pressure and with the regulator in the tank the system essentially is a "dead head"
If your feeling frisky you could try this: leave the stock pumps in the basket configure a fitting for the feed line to regulator, take the regulator out and in its place add a fuel filter, Out of the filter to the stock line, Up front add a return style regulator and add a return line. If that proves to be not enough flow you could replace the factory line with -6an or -8. At that point you could modify the inlet fitting to a larger -6AN or -8AN.
OR
you could just buy the TTM fuel rail and injectors which is proven good 550+ whp.
If your feeling frisky you could try this: leave the stock pumps in the basket configure a fitting for the feed line to regulator, take the regulator out and in its place add a fuel filter, Out of the filter to the stock line, Up front add a return style regulator and add a return line. If that proves to be not enough flow you could replace the factory line with -6an or -8. At that point you could modify the inlet fitting to a larger -6AN or -8AN.
OR
you could just buy the TTM fuel rail and injectors which is proven good 550+ whp.
MBWorld Fanatic!
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From: Puerto Rico
2005 E55 AMG
Can you place 2 walbro's in the oem basket? The oem pumps sure look identical to walbro's and I put out 425whp on a single walbro in my VW GTI without a single hiccup. Imagine two.
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From: Tacoma WA
Bicycle
Member
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2008 GL550
I've never seen the pump setup (yet) on our cars however twin 255 Wally's have been used for a long time by the GN crowd and alot of guys have switched to this versus the twin wally's w/ great success http://www.deatschwerks.com/dw300-in-tank-fuel-pump
It's a very stout single pump.
It's a very stout single pump.
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From: Northern Va
Dirt Scooters
Aeromotive has a 340lph pump but the bosch 044 flows alot more than even that pump. I had a triple fuel hat on my cobra that held 3 310lph pumps and was changed into a return style system. I've thought about what direction i want to go for the fuel system but haven't exactly decided. I don't want to turn it into a return sytem if i dont have to. If i increase the fuel line size and custom rails i think it will be ok. Time will tell.
Member
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2008 GL550
The 044 is an inline pump I thought...as for Aeromotive, Do some research before that investment. I found alot of negative across the board regarding Aeromotive pumps, maybe they've gotten better...don't know. I did a ton of research for my GN ( wound up using a Weldon personally ) but I was very close to considering Fuelab too.
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MBWorld Fanatic!
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From: Northern Va
Dirt Scooters
The 044 is an inline pump I thought...as for Aeromotive, Do some research before that investment. I found alot of negative across the board regarding Aeromotive pumps, maybe they've gotten better...don't know. I did a ton of research for my GN ( wound up using a Weldon personally ) but I was very close to considering Fuelab too.
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Member
Joined: Sep 2010
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2008 GL550
Fuelab is only inline, I was comparing to the 044...I didnt realize the 044 could be run in the tank, thats probably a good setup. I know some people run voltage boosters to the pumps to increase flow too ( i used to do that w/ the twin Wally's in the GN )
Thread Starter
Joined: Jan 2009
Posts: 1,106
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From: Lebanon
Cls63 & C32
Thanks for all infos, but i nead a precise answer to my question, a have done on my c32 the 3.7L engine swap and i put the 55 sc on the v6 engine, so i need more flow to the rail, the c32 doesn't have an in tank regulator, my setup will be: stock in tank pump to the bosch 044 in line then regulator, my question is how the stock fuel pump will affect the flow of the 044 pump, it will flow more, less?
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From: Puerto Rico
2005 E55 AMG
Thanks for all infos, but i nead a precise answer to my question, a have done on my c32 the 3.7L engine swap and i put the 55 sc on the v6 engine, so i need more flow to the rail, the c32 doesn't have an in tank regulator, my setup will be: stock in tank pump to the bosch 044 in line then regulator, my question is how the stock fuel pump will affect the flow of the 044 pump, it will flow more, less?
It's not better or worse, no matter what pump you have behind the 044, the 044 will determine the max output.
Thread Starter
Joined: Jan 2009
Posts: 1,106
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From: Lebanon
Cls63 & C32
The stock fuel pump will only serve as a pre-pump to the 044 which will become your main pump. The oem pump will only supply volume which they can do VERY easily, the 044 will supply the volume AND the pressure which is what matters. It's a good setup.
It's not better or worse, no matter what pump you have behind the 044, the 044 will determine the max output.
It's not better or worse, no matter what pump you have behind the 044, the 044 will determine the max output.
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Joined: Apr 2009
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From: Tacoma WA
Bicycle
Ive been running dual 044 pumps and return line for quite sometime now, maybe a year and half? Almost sure I had the first significantly modified fuel system on any 55k platform. It works very well but is labor intensive, Fuel slosh is the largest obstacle to making it work.
MBWorld Fanatic!
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From: Puerto Rico
2005 E55 AMG
Why not eliminate the oem regulator and just run an inline 044 and install a regulator after the inline? Or does the syphoning on this car use the regulator? In the Infiniti G35 I had the regulator also moves gas from one tank to another so it was a little complex to install a return system, you couldn't just remove the oem regulator all together, but rather install a sort of bypass.
Super Member
Joined: Apr 2009
Posts: 837
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From: Tacoma WA
Bicycle
Why not eliminate the oem regulator and just run an inline 044 and install a regulator after the inline? Or does the syphoning on this car use the regulator? In the Infiniti G35 I had the regulator also moves gas from one tank to another so it was a little complex to install a return system, you couldn't just remove the oem regulator all together, but rather install a sort of bypass.
Super Member
Joined: Apr 2009
Posts: 837
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From: Tacoma WA
Bicycle
