what pressure should the fuel rail give me - Mercedes-Benz Forum
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post #1 of 2 (permalink) Old 05-22-2019, 10:15 AM Thread Starter
BenzWorld Junior Member
Date registered: May 2019
Vehicle: 2000 slk 170
Location: truro cornwall
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(Thread Starter)
Angry what pressure should the fuel rail give me

Hi all

Still not fixed my running st going through things 1 by 1

put a pressure tester on the nipple on the end of the fuel rail

there was no pressure but not been run for a week or so.

turned the key 2nd position went up to 48 psi started the cat went to 52 psi

but as time went on went down to 37 psi is this ok thanks


can i fix it is offline  
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post #2 of 2 (permalink) Old 05-22-2019, 03:25 PM
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Date registered: Jan 2007
Vehicle: 1998 SLK 230
Location: Melbourne, AU
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I believe it should be 3.5 - 3.7 bar for a stock regulator 52psi - 54psi.

this is with the little hose unplugged to the regulator and car running (idle)

- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator

Last edited by Subby_; 05-22-2019 at 03:39 PM.
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