Quote:
Originally Posted by Number_Cruncher
>>Well that makes at least two of us that have never had one apart.
Thanks Barry!
Looking at the lift pump on my OM606, the outlet of the lift pump is the port closest to the body of the injector pump - to me, perhaps suggests the fuel is pumped on the return stroke.
If the pump is actually spring driven, then, I think the pressure fluctuations might not be so abrupt - a poorly damped gauge can easily make a small pressure change look much more dramatic than it really is.
If, however, the pump is a fixed displacement pump, then the pressure spikes will be higher.
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Forced Induction used a normal undampened gauge and it was almost destroying itself quite a few posts back with engine at idle. A fluid filled gauge is a requirement.
Fortunatly the orientals have a cheapie liquid dampened gauge with a 2 1/2 inch face. This gauge is well distributed in north america as well. Yellit (kevin ) has two installed of the three or four he owns. He swapped gauges and the calibration seems good gauge to gauge.