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Old 09-12-2010, 11:51 PM   #1
Saintsp
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Default Question bout fuel system

i know there are people doing one intake walbro feeding a single 044 straight without any surge tank.Is it possible to do 1 intake walbro feeding 2 044 pumps direct without any surge tank in between?
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Old 09-13-2010, 11:19 PM   #2
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Originally Posted by Saintsp View Post
i know there are people doing one intake walbro feeding a single 044 straight without any surge tank.Is it possible to do 1 intake walbro feeding 2 044 pumps direct without any surge tank in between?

Any opinion?
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Old 09-14-2010, 10:41 AM   #3
02WRX2.5
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I don"t think the wally would keep up. As in a surge tank the return line from injector gets put into the surgetank to help keep full. So the 44's use that return line as feed, in your situation, return lines goes to tank which will keep you from using as volume for 44's so i think you would run into starvation issues.
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Old 09-15-2010, 01:51 AM   #4
Saintsp
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Originally Posted by 02WRX2.5 View Post
I don"t think the wally would keep up. As in a surge tank the return line from injector gets put into the surgetank to help keep full. So the 44's use that return line as feed, in your situation, return lines goes to tank which will keep you from using as volume for 44's so i think you would run into starvation issues.
what bout single 044?
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Old 10-18-2010, 06:52 PM   #5
Jspike
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Just add a Surge tank
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Old 10-18-2010, 11:46 PM   #6
Saintsp
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Just add a Surge tank

Used to have a surge tank just that can't stand the smell so removed it.Now is one wally feeding one 044.Just worried that it might not be able to keep up
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Old 10-19-2010, 12:28 AM   #7
NSFW
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I have a hunch that the smell was from the lines you used, not from the surge tank itself.

Fuel smell is a pretty common complaint of people who use the wrong lines.
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Old 10-19-2010, 06:54 AM   #8
Saintsp
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I have a hunch that the smell was from the lines you used, not from the surge tank itself.

Fuel smell is a pretty common complaint of people who use the wrong lines.

Well the smell 's gone.Now just waiting for a tune.Just wondering if the fuel pump will be enough to support my hp range.Running a BW s300 atm
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Old 10-19-2010, 06:45 PM   #9
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Your limiting factor is total fuel flow of the pumps in series
the Walbro 255 flow @ 0 psi is ~ 290 Lph
the Bosch 044 flow @ 65psi line pressure (~ 45psi base pressure + 20psi manifold pressure) is ~290 Lph
* At that manifold pressure (65psi) the Walbro supplies enough flow

* However when the line pressure of the 044 is 45psi it will flow ~307Lph so "theoretically" it will be starved of flow from 45psi to about 63psi

These are all numbers, and in the real world you may be OK. But there's a reason why machinery/car parts are designed and numbers are calculated.

So your setup is borderline so it may work without an issue or "theoretically" the Bosch pump may experience cavitation and undergo early impeller wear- but i doubt that would cause its demise .
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