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#1
10-11-2010, 11:06 PM
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Dead Fuel Pump
1991 300E (103). Just got the head back on and tired to fire it up. No fuel. There are two FP's in line. The first pump is dead (bottom pump). Will the failure of the first pump stop fuel flow to the fuel distributor? Just making sure the dead pump is the reason for no fuel, and not a blockage, (The car has been sitting for approx 10yrs).
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Tim 05 E320 86 930 05 Range Rover HSE 95 Range Rover SWB 63 Series IIa Several boring BMW's for this kids.... 
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#2
10-12-2010, 08:12 AM
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Most likely you need to have the fuel tank flushed OR replaced.
Yes, you need both fuel pumps.
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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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#3
10-12-2010, 10:04 AM
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Tim, I have read about folks resurrecting fuel pumps by running them backwards with diesel fuel poured into the discharge side. Of course, this is done with the pump removed and on a bench with a 12-volt battery momentarily applied to the leads. It's worth a try before replacing a dirty/clogged fuel pump.
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Fred Hoelzle
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#4
10-12-2010, 10:45 AM
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Quote:
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Tim 05 E320 86 930 05 Range Rover HSE 95 Range Rover SWB 63 Series IIa Several boring BMW's for this kids....
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#5
10-12-2010, 10:48 AM
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Quote:
How do you run it backwards? Reverse the leads?
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Tim 05 E320 86 930 05 Range Rover HSE 95 Range Rover SWB 63 Series IIa Several boring BMW's for this kids....
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#7
10-12-2010, 01:16 PM
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Quote:
Maybe I am missing something here. The first pump is dead, impeller not turning, and second pump is working, impeller turning, the first pump being dead is stopping the fuel flow to the second pump. If the second pump works, why do I need to replace it (the second pump) when the first pump is preventing fuel feed to the second pump? You have answered my original question though, which was if the first pump is dead, would that stop fuel flow to the second pump. Thanks! I just don't follow the logic for replacing the second pump.
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Tim 05 E320 86 930 05 Range Rover HSE 95 Range Rover SWB 63 Series IIa Several boring BMW's for this kids....
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#9
10-12-2010, 03:07 PM
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Quote:
Thanks. I'll try that.
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Tim 05 E320 86 930 05 Range Rover HSE 95 Range Rover SWB 63 Series IIa Several boring BMW's for this kids....
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#10
10-12-2010, 05:18 PM
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You misunderstood what I meant...I mean for the car to run properly, you need both pumps to RUN, not to be replaced.
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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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#11
10-12-2010, 08:53 PM
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Quote:
__________________
Tim 05 E320 86 930 05 Range Rover HSE 95 Range Rover SWB 63 Series IIa Several boring BMW's for this kids....
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