'86 420SEL: Noisy Fuel Pumps

[Randy]

Hi, My car, an '86 420SEL with 151,000 miles, did not run when I bought it in '03, due to failed fuel pumps. I replaced the pumps with the correct Bosch pumps, changed the fuel filter, and got it going. Since December 2003 I have put about 5000 miles on it. Sometimes the whirring from the pumps is very noticable from inside the car at idle, such that last night my passengers asked if we "are going to make it". It has never offered a minute's trouble since I have owned it. Right now the fuel tank is about 2/3 full. Is there some other component in the fuel system which can cause this if it is failing, or is this the nature of the beast, or? Thanks.

[whunter]

In 70% of these noise issues, the cause is mounting rubber degrading/hardening.

Please call or e-mail this list to Phil for a special order on these parts.
1-888-333-4642 - philip@peachparts.com 9AM-6PM ET

MB# 1244780353
Rubber spacer tube/sound damper
Two per car.
Roughly $2.70 each

MB# 0000910182
Rubber spacer tube/sound damper
One per car.
Roughly $3.50 each

MB# 1264780053
Rubber spacer tube/sound damper
One per car.
Roughly $4.00 each

MB# 1269880011
Buffer, pump/filter bracket to bracket on cross member
Four per car.
$4.29 each





Have a great day.

[Randy]

Ok, good idea, while I am under there, can you get the rubber covers for the electrical terminals on the pump? Mine are rotten.
Thanks! Randy

[whunter]

Originally Posted by Randy

Ok, good idea, while I am under there, can you get the rubber covers for the electrical terminals on the pump? Mine are rotten.
Thanks! Randy

Item Number: 1239971681
Main Category: MB
Sub Category: Body Electrical
Description: Grommet, Electrical Cables To Fuel Pump, (90 degree rubber connector cover boot)
Weight: 0.100

[560 SEL]

If the car is hard starting either cold are hot then you need to replace the accumulator when they go bad it causes the pumps to whine louder its a pressure thing.
Bob