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The easiest way to tell if its bad is if your acceleration is a bit slow off the line. Or acceleration in general is a bit poor down low but the car is quick up high.
Its a common problem and there are 2 fixes.
The cheap way is to replace the MB pump with the Ford lighting pump. Its the same bosch unit just with a ford price tag.
You can find them on ebay or online suppliers for under $100 shipped.
The bit more expensive but beneficial way is to upgrade to a johnson pump as mentioned. I believe letmotorsports has them for $175, benefit is a higher flowing pump compared to the oem bosch unit.
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Current:
05 E320 CDI
07 GL320 CDI
08 Sprinter
05 Dodge Cummins
01 Dodge Cummins
Previous
2004 E55 AMG
2002 C32 AMG (#2)
1995 E300
1978 300D
1987 300D
2002 C32 AMG(blown motor :[
1981 300SD
1983 300SD
1987 300SDL
2002 Jetta TDI
1996 S420
1995 S500
1993 190E 2.6
1992 190E 2.3
1985 190E 2.3 5-Speed
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