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#1
03-22-2001, 04:45 AM
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Can anyone tell me why 2 fuel pumps, will it still run ok with just one and the other bypassed?
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#2
03-22-2001, 12:31 PM
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MB used either 1 large pump or 2 smaller pumps on cars from 1986 - 1993 with CIS fuel systems. 1 small pump doesn't have the needed volume to run car at higher RPM's. With 2 pump system their is less AMP draw & higher out-put than the 1 larger pump. The car should run IF the hoses are removed from the BAD pump. System pressure is around 90psi.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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