How do you know when the fuel pump is going bad on a 1990 420 sel


Asked by Nov 07, 2013 at 07:05 AM about the Mercedes-Benz S-Class

Question type: Maintenance & Repair

The car is starts fine but when you drive a distance it starts to hesistate as if its running out of gas. the car cuts offs restarts drives alittle ok and returns to the same

1 Answer

Thomas Smith

It could also be your fuel pressure regulator going bad you might want to have it checked or find a fuel pressure guage to check it if your car is under warranty i would take it to the dealer ship

Your Answer

Add photo

Related Questions

  • My MB 1991 420 SEL has 220,000 miles cranks on ignition does not start. What should I do? 8 answers

    My MB mechanic said that our 1991 MB 420 SEL needs new ignition control unit. The cost is $920 for part and $172 labor. It also has an air pump that is seized. The mechanic said it will cost additio...

    Mercedes-Benz 420-Class


    Maintenance & Repair

  • Start and stall 2 answers

    My 89 Benz 420 Sel starts and stalls right away. I replace fuel pumps and fuel pump relay. The problem still the same. Any suggestions please.

    1989 Mercedes-Benz 420-Class 420SEL Sedan


    Maintenance & Repair

  • 1990 560 sel will not start. Not getting fuel to engine 5 answers

    I have a 1990 560 sel. Vehicle wil not start now. Not getting fuel to engine. I pour gas into intake and it will run. Fuel pumps or relay fuse need replacing??

    1990 Mercedes-Benz 560-Class 4 Dr 560SEL Sedan


    Maintenance & Repair

  • fuelproblem??? Mercedes 560 SEL shuts down after starting while idling, sometimes while driving 14 answers

    My 560 SEL sometimes shuts off after starting, or shuts off while driving. If it shuts off while driving, the yellow indicator light to the left of the fuel gauge for the reserve tank use comes on, b...

    1991 Mercedes-Benz 560-Class 4 Dr 560SEL Sedan


    Maintenance & Repair

  • sale price? 2 answers

    Am thinking of selling my 91 420 SEL. Blue Book says 4500, are they kidding. Isnt this car a classic...something along the lines of the last year of the big boxy classic all time mercedes benz body ty...

    1991 Mercedes-Benz 420-Class 4 Dr 420SEL Sedan


    Shopping & Pricing

Search Mercedes-Benz S-Class Questions

Mercedes-Benz S-Class Experts

#1 Tom Demyan
Tom Demyan
Reputation 630
#2 Michael Kane
Michael Kane
Reputation 460
#3 lightGear
Reputation 410
View All

Related Models For Sale

Used Mercedes-Benz E-Class"
784 Great Deals out of 22,961 listings starting at $1,850
Used BMW 7 Series"
214 Great Deals out of 5,899 listings starting at $2,995
Used Mercedes-Benz CLS-Class"
114 Great Deals out of 2,495 listings starting at $7,699
Used Mercedes-Benz C-Class"
897 Great Deals out of 32,346 listings starting at $1,900
Used Mercedes-Benz SL-Class"
128 Great Deals out of 3,668 listings starting at $1,500
Used Mercedes-Benz S-Class Coupe"
3 Great Deals out of 1,157 listings starting at $89,261
Used Mercedes-Benz CL-Class"
29 Great Deals out of 652 listings starting at $4,900
Used Audi A8"
42 Great Deals out of 1,813 listings starting at $2,995
Used Land Rover Range Rover"
136 Great Deals out of 4,936 listings starting at $4,495
Used Lexus LS 460"
113 Great Deals out of 2,294 listings starting at $9,999
Used BMW 5 Series"
695 Great Deals out of 19,107 listings starting at $1,500
Used Mercedes-Benz GL-Class"
301 Great Deals out of 4,427 listings starting at $7,999
Used BMW 6 Series"
127 Great Deals out of 3,046 listings starting at $5,995
Used Porsche Panamera"
65 Great Deals out of 2,364 listings starting at $29,997
Used Jaguar XJ-Series"
79 Great Deals out of 2,804 listings starting at $2,500