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Old 12-01-2016, 03:53 PM
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funola funola is offline
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Location: NYC
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Quote:
Originally Posted by europower View Post
I am seeing a white surge of what i suspect maybe air in the hard plastic line coming from lift pump to spin on filter housing on my 1983 w123 300D us spec, im having battery drain every morning since about a week ago and im ruling out air in the system as the cause.
I see no bubbles but rather a whitish surge of what could be normal fuel ???
THANKS!
White surge or foamy fuel are air bubbles that has been whipped into smaller air bubbles by the lift pump. If your primer pump is new and not leaking, then the air is coming from upstream of the lift pump, i.e. the metal fuel supply line, which is known to develop pin hole rust under the fuel line clamps. Or could be a clogged in-tank fuel strainer. When the clog/ restriction is bad enough, makes the lift pump work extra hard and outputs foamy fuel- that process is called cavitation.
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