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Old 08-03-2012, 07:50 AM   #1 (permalink)
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Default Another stage 3 fuel component/specification thread

Ok first off my mods:

47lb E3
Stage 3 fuel pump/rail/PCM
DSP tuned

I've ran this setup now for about 3 years without problem untill now. I'm having issues under WOT and full boost. My power completely breaks up. Also i've developed an extended crank after sitting for a few hours. I re-gapped my plugs and replaced my plug wires with a spare set that I keep in my trunk. Problem still there of course. Naturally I check fuel pressure, at idle it's 45psi with vacuum applied to the rail regulator and without vacuum it's still 45psi. Judging by this I would say the regulator is bad due to no change in pressure. But from what I understand rail pressure on a stage 3 should be at 52psi and without vacuum 58psi, is this correct? If so this combined with the dropping fuel pressure while sitting would lead me to believe that the in tank regulator may be on its last legs. My question is can this be bought seperatly from the entire module? I searched and found a thread that's a few years old talking about a possible group by from the manufacturer but other than that I don't know. I really would like to keep the stage 3 components rather than get back into buying/tuning other parts again.
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Old 08-03-2012, 08:40 AM   #2 (permalink)
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I would go with a pump gettin weak way before a reg goin bad! Is it the original stg 3 pump? If so id throw a new Wally in and go from there.
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Old 08-03-2012, 09:13 AM   #3 (permalink)
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Quote: Originally Posted by Creamer03 View Post
I would go with a pump gettin weak way before a reg goin bad! Is it the original stg 3 pump? If so id throw a new Wally in and go from there.

Yes original stage 3 pump. I know that they are put under high demand, mine certainly has. I bought a walbro a few years back but it was defective out of the box. Maybe 2nd times a charm
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Old 08-03-2012, 10:13 AM   #4 (permalink)
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ditto -- fuel pump would be my guess, afr @ wot?
(while you're in there do a rewire)

to be 100% sure you'll need to measure fuel pressure under wot
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Old 08-03-2012, 10:50 AM   #5 (permalink)
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I'd bet money its a pump! Mine was having similar symptoms as yours when it started messing up
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Old 08-11-2012, 11:26 AM   #6 (permalink)
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Update: I replaced the pump today with a walbro 255. Problem solved! Creamer03 gets an E-high 5 for the correct diagnoses
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Old 08-11-2012, 04:48 PM   #7 (permalink)
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Quote: Originally Posted by turbo-tony View Post
Update: I replaced the pump today with a walbro 255. Problem solved! Creamer03 gets an E-high 5 for the correct diagnoses


Good deal! Glad i could help!
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Old 08-19-2012, 09:50 PM   #8 (permalink)
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i have a similar problem with my stage 3 pump and will be installing a walbro 255 to hope it fixes it.did u need a retune after switching the pump?
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Old 08-20-2012, 12:59 AM   #9 (permalink)
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Quote: Originally Posted by MOSP Performance View Post
i have a similar problem with my stage 3 pump and will be installing a walbro 255 to hope it fixes it.did u need a retune after switching the pump?



You should not! Unless your car gets substantially richer you would need one then
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Old 08-20-2012, 09:12 AM   #10 (permalink)
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Quote: Originally Posted by Creamer03 View Post
You should not! Unless your car gets substantially richer you would need one then

This.
My S3 car has never seen a S3 pump. A Walbro 255 has been in there, 4 years later 50k+ no issues.
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Old 02-09-2013, 10:50 AM   #11 (permalink)
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Trying this asap. I have the same issues with my stage 3 setup. I have the original stage 3 pump. Hope this does the trick. Thank you for posting this!!!!
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Old 02-17-2013, 05:10 PM   #12 (permalink)
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Default Another stage 3 fuel component/specification thread

The extended crank is from the check valve In the pump. When it starts to go the line pressure slowly drops over time. So it takes a little while for the pressure to build back up. Try cycling the key a few times after it sits for a while. It should help with the long crank.


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