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Old 01-18-2013, 08:43 PM   #1
pdxmotorhead OP
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EFI Fuel pump?

Wonder if this pump would be a decent replacement?
http://www.summitracing.com/parts/sum-g3138/overview/
or this one...
http://www.summitracing.com/parts/ae...0/media/images
I have a 950, but the various fueling issues are interesting...
Does the 990 efi have a return line? or does it just pressurize the injectors?

Just wondering..

Dave
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Old 01-18-2013, 10:13 PM   #2
Head2Wind
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the 990 does not have a return line, it "dead heads" to the injector rail. The FPR (fuel pressure regulator) is just after the pump and after the 7-10 micron rated filter, it just dumps the excess fuel back into the tank..

the 950 uses a completely different system and substantially lower fuel pressure... the 990 runs at ~51PSI the 950 is 1.5-2PSI
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Old 01-19-2013, 12:48 AM   #3
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HMM. I do a lot of tuning on EFI race engines,, cars, some bike powered dirt cars, I found that pumps are way happier moving fuel than dead heading to the injectors.. I bet you could reduce the EFI fuel issues with a very small bleeder line
from the fuel rail back to the tank.. Enough so the fuel in the lines does not heat soak and so the pump gets cooling..
It could have a .020 orifice in it just so the fuel moves...

Be interesting to have a temp probe in that line right after the pump...


Just mulling ove rthe important world problems, fuel pumps, beer selection, the ususal...

Dave
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Old 01-19-2013, 02:29 AM   #4
Peanuts
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At the kind of MPG we get out of the 990 I think there is quite a flow through that pump ;)
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Old 01-19-2013, 03:55 AM   #5
StevenD
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the stock pump does plenty of bleeding back to the tank via the also in tank pressure regulator. its just the connection to the fuel rail thats a bit longer then with systems that have a regulator near or at the fuel rail.

Heat can build up in the line but i doubt that is near being an issue.
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Old 01-19-2013, 10:58 AM   #6
Head2Wind
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Fuel heat could be a issue, and i agree that flowing fuel through the rail would definitely reduce the fuel temps at the injectors, the question would be what would the outcome be? Granted cool/cold fuel can equal greater density and potential power, perhaps the greatest improvement would be related to not boiling the fuel in the rail. At 51 psi that temp is pretty high.

The challenge with the throttle bodies and the fuel rails is there is very little space to do much of anything like adding a flow through port at the end of the rail..... personally i'd prefer the FPR at the end of the rail with a return line, but as presently designed/built its very crowded in that area already... it would require a new fuel rail design, and to retrofit to an existing throttle body would be difficult.

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