I have a 93 300E with the two Bosch fuel pumps connected in series. This is the same setup as many other ealry 90's W124s. Here's my questions:

1. Do both the pumps always run together or does one of the pumps turn on only when under certain load/rpm conditions?

2. Does anyone know the combined output capacity of this series confirguration ? Liters/hour? The WIS software mentions 90L/hr but I think that must be in reference to the single pump setup used earlier. The 93 500E uses the two Bosch pumps in series and would require more than 90L/hr so it must be higher.

Thanks for either answer.

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2002 E55 Stock
Sold my project car: 1993 300E (3.2L) Blower running 0.8 Bar, Re-badged E32 Kompressor, Apexi Piggyback ECU, 310cc injectors, 255LPH Walbro Fuel Pump, Water/methanol injection, Quad SS Exhaust Tips, 3" SS exhaust with high-flow Cat, 17" Monoblocks 225/45/17, Brembo BIG Brake upgrade, Euro-headlamps, clear corners, Euro-tail lamps, keyless entry, CD AMPs Subs etc...

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