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Old 05-10-2012, 08:49 AM
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golf 3 1995 cabrio

Hi please advise recently bought a golf cabrio it has an external fuel pump and asubmessive internal pump on the same line what's the purpose of this?

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Old 05-10-2012, 06:02 PM
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The submersed pump in the tank, is a low pressure pump designed to supply the external pump. Its purpose is to provide the volume of fuel to the external pump.
The external pump is where the pressure is made. The V dub Cabby needs a pretty hefty pressure, something like 65 -75 lbs.
The pressure pump can not pull fuel from the tank, but if it has a volume of fuel delivered, it can make a buttload of pressure.
A tell tale sign that the in Tank Pump (also called delivery pump) is not working, is that the pressure pump will make a loud whining sound, as it is overworked trying to pull the fuel out of the tank and make pressure too.
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