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Old 01-16-2020, 06:48 AM   #1
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Join Date: Feb 2013
Location: Vienna, Austria
Default Mercedes fuel pump for K-Jet

The fuel pump on my 1980 GLT (B23E) seems to become weak and I'd like to replace it.
Would it be beneficial to use a higher rated (pressure) pump? Most K-Jet replacement pumps are listed as having 5 bar (72.5 PSI) e.g. Bosch 0580464126
But Bosch also sells a Mercedes pump with a 6.5 bar (94 PSI) pressure rating: Bosch 0580464125

Which one should I get?
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Old 01-16-2020, 11:20 AM   #2
Burnt Sierra Madre
Join Date: Jan 2009
Location: Fort Joe Smith, Klendathu

seems to become weak
1. Test the pressures instead of throwing parts at it
Originally Posted by lummert View Post
Dammit, Lummert.
Originally Posted by Jesse8931 View Post
Well keep us updated on how your dumbass plan goes.
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Old 01-18-2020, 11:14 PM   #3
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Join Date: Feb 2008
Location: Kansas, USA

Originally Posted by VolvoGLT View Post
Would it be beneficial to use a higher rated (pressure) pump?
Offhand, K-Jet has a pressure relief valve, and this may have to be re-calibrated when a higher psi pump is used....if its fuel returned to tank can handle increased fuel volumes.

If pressure relief circuit can not return all by-passed fuel to tank, your engine will run richer.
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Old 01-19-2020, 03:19 AM   #4
LH-Jet & Carb Free Zone
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Join Date: May 2003
Location: Duvall, WA

Unless you're planning to add a large turbo with lots of boost, I think you'll be fine with the stock 949 pump.


1982 242Ti - black, M46. 1985 245Ti - blue, M46. Formerly Blue245Ti, 245GT-Turbo, and, originally 242GT-Ti.
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