[Vwdiesel] Injection pumps Old Volks -- ( workings explained ).

[H .Hagar]

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Internal resure -- why does it have to be so high ???.    answer: to push f=
uel to fill high pressure cylinder --intake passage is small and open for a=
 very short time  --say when pump is turning 2500 RPM.     Further more the=
 timing piston design needs lots of pressure. about  30 Psi  to  about 120 =
Psi.   I have heard 160 Psi mentioned . I have measured pumps and veryfy th=
at internal pump pressure is quite high. That explains the notorious leakin=
g pumps , and mysterious low MILAGE.

Have fun.                                                                  =
                                                      Hager.
PS:  A regulator of sorts can be found opposite corner top from fuel banjo =
 =2ENA pumps.
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