wombat
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| posted on 8/12/14 at 09:54 PM |
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ST170 Fuel Rail Options?
Was going to use the standard ST fuel rail with the pressure thingy blocked off and an 8mm tail fitted to give a return, but now wondering if I
should get a custom rail made?
Thoughts anyone?
Cheers
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mark chandler
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| posted on 8/12/14 at 10:17 PM |
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Why not just use the rail as designed and take the return back to the tank?
[Edited on 8/12/14 by mark chandler]
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big_wasa
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| posted on 9/12/14 at 11:15 AM |
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The st170 has no return or pressure regulator it has a damper. You could adapt the port for the pressure switch or I would see if a Black top rail
will fit.
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kingster996
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| posted on 9/12/14 at 11:23 AM |
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My Silvertop has a modified ST fuel rail - can take a pic if you want?
I used to be indecisive, but now I'm not so sure
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wombat
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| posted on 9/12/14 at 11:23 AM |
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Damper !!! Thats the word I was looking for last night :-)
Following what someone else had done, I was going to blank off the damper, remove the sensor from the end of the rail and tap an 8mm fitting in the
end.
Was thinking that a custom rail would probably have less risk of air leaks with a straight in/return.
Are you saying a blacktop rail is effectively just that?
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wombat
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| posted on 9/12/14 at 11:28 AM |
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kingster - picture always helpful :-)
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DW100
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| posted on 9/12/14 at 12:26 PM |
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Something that would be really useful for people doing things like this is that some cars have a rear mounted fuel filter with built in regulator,
flow and return to tank pipes, and a single regulated pressure line going to the front or the car and fuel rail.
I'll try and look up a part no.
Edit to say research shows the filter / regulator I was looking at operates at 6.4 Bar. Lower pressures are achieved by PWM of fuel pump using
feedback from fuel pressure sensor.
[Edited on 9/12/14 by DW100]
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kingster996
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| posted on 9/12/14 at 12:36 PM |
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This should show you the differences - std ST170 and modded one (with yellow hoses)
[Edited on 9/12/14 by kingster996]
I used to be indecisive, but now I'm not so sure
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big_wasa
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| posted on 9/12/14 at 02:12 PM |
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Yep that puts into pictures what I mean by using the pressure sensor port for the return but what are you using to regulate the pressure ?
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coozer
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| posted on 9/12/14 at 02:34 PM |
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Like Kingster there I took the pressure sensor off, drilled right through and put a barbed fitting on blanking the outside off with a plate, all just
to tidy it up and point the return back to meet up with the pcv.
1972 V8 Jago
1980 Z750
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kingster996
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| posted on 9/12/14 at 04:04 PM |
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quote:
Originally posted by big_wasa
...but what are you using to regulate the pressure ?
You can just see the pressure reg to the left of the modded fuel rail.
I used to be indecisive, but now I'm not so sure
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DW100
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| posted on 9/12/14 at 05:01 PM |
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This filter/Regulator for a E46 BMW could be useful if a little long.
BMW 3 SERIES E46 320 325 330 316 318 MAHLE ORIGINAL FUEL FILTER PRESSURE KL149
 
Description
Regulated to 3.5 Bar (3.0 With Vacuum)
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wombat
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| posted on 9/12/14 at 06:25 PM |
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🍻 great stuff thanks, will stick with my plan then.
Thanks again.
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