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How to run an FMU with Returnless Fuel System???

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How to run an FMU with Returnless Fuel System???

Old 10-01-2007, 01:05 AM
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Default How to run an FMU with Returnless Fuel System???

Does anyone know how to?

Another option would be to add an extra injector, again, how could that be done? (on a budget).

Thanks!
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Old 10-01-2007, 02:13 PM
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Default Re: How to run an FMU with Returnless Fuel System???

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Old 10-01-2007, 06:23 PM
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Default Re: How to run an FMU with Returnless Fuel System???

bigger injectors and a afc
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Old 10-01-2007, 06:27 PM
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Default Re: How to run an FMU with Returnless Fuel System???

The only problem is that I cant run anything that has to do with the stock ecu (because I have a german car, no one makes computers for my car).

So I am looking for a mechanical way of doing this, or adding a second pump (but how would I tune this? etc)
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Old 10-01-2007, 06:54 PM
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Default Re: How to run an FMU with Returnless Fuel System???

no way to run an fmu without a return line plain and simple. the fuel has to go somewhere right
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Old 10-01-2007, 07:26 PM
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Default Re: How to run an FMU with Returnless Fuel System???

How hard would it be to run a return line? I'm sure you've got several ports on the tank for the vapor lines/purge etc.
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Old 10-01-2007, 07:41 PM
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Default Re: How to run an FMU with Returnless Fuel System???

^ True, but how do I fabricate a return style fuel system?

I would have to drill the stock fuel rail for one, and what about all the sensors that controll the flow for the returnless fuel system? HMMM...
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Old 10-01-2007, 07:57 PM
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Default Re: How to run an FMU with Returnless Fuel System???

Honestly, I have no clue about all the details of how a returnless system works. If you're looking to turbo this thing properly, a standalone engine management system might be your best bet. If you wanna ghetto rig up some ---- that will boost 3 psi and run super rich because you don't want it to blow up, adding extra injectors to the intake is a better bet than an FMU on a returnless system.
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Old 10-01-2007, 08:53 PM
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Default Re: How to run an FMU with Returnless Fuel System???

Originally Posted by tr-performance
^ True, but how do I fabricate a return style fuel system?

I would have to drill the stock fuel rail for one, and what about all the sensors that controll the flow for the returnless fuel system? HMMM...
custom fuel rail, regulator and a return line to the tank
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Old 10-02-2007, 03:03 AM
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Default Re: How to run an FMU with Returnless Fuel System???

jegs and summit even sell a return line diy kit.
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