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1983 Euro 500SEC AMG, 83 SEC custom convertible, 2x 84 500SEC, 02 w203coupe, euro 1985 300d
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1,579 Posts
Discussion Starter · #1 ·
restoring yet another wreck of an sec that has been sitting for 5 years, did the usual and replaced all the rubber lines fuel pump, filter, cleaned everything from engine back including the level sensor and washed out the tank with acetone+ pressure washer along with replacing the screen and is now drying out in the hot fl sun-------one question for a more experienced one than I-------the smaller hole on the bottom of the tank (return line?) next to the larger hole where the screen is located had a lot of build up in it but it will not clear out-------is this supposed to remain closed?? is there a valve that is stuck shut?????? which way is the fuel supposed to travel through this opening??? in or out of the tank??? thanks for the input any ideas on how to remedy this situation???
 

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Registered
1983 Euro 500SEC AMG, 83 SEC custom convertible, 2x 84 500SEC, 02 w203coupe, euro 1985 300d
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1,579 Posts
Discussion Starter · #2 ·
this sec looks to have been someone elses money pit before i picked it up---- low miles and it passed emmisions in 2000 before the owner kicked the bucket and went into storage----the entire engine vacum system has been replaced as well as the water pump cap coil wires an no nasty build up in the crank case new ac compressor, condenser, r12 conversion--(havn't gotten to check the evaporator)---looks like a reman cis as well as the heads being really clean ----looking forward to putting everything back together for a daily driver thanks for any imput
 

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1985 500SEC
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200 Posts
Check out thread 'fuel in trunk' by Kalifornia, 03-18-06, MLB87560SEC posted several diagrams in reply. MBUSA sells the 2 service CD's for only $ 20. They should be installed with Steve Nervig's free index. All this info/links can be found in the DIY thread above, or use the 'search this forum' function on the top right. Good luck, Teutone (aka Horst K)
 

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1991 500SEC 55K mi. 1987 560SEC Now 153K mi. 2020
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5,461 Posts
Hi Aaron,

Horst mentions a post I did a while ago that has probably everything you need. I include this as well. Looks interesting and I'm unsure if I included it in the original post.

I hope it helps.

Please ad the model year to each of your profile vehicles. Makes it easier to respond accurately.

Cheers, MBL
 

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Registered
1983 Euro 500SEC AMG, 83 SEC custom convertible, 2x 84 500SEC, 02 w203coupe, euro 1985 300d
Joined
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1,579 Posts
Discussion Starter · #5 ·
Thanks for the info, specs by the way are 1984 us 500sec----i looked under the different diagrams but this line that appears to be plugged (or mabye it is a valve that only opens one way) is one that regularly has gas that travels through it, it is not the vent system that travels the length of the car back to the charcoal filter--------will keep looking through the forms thanks again for the help though ---i think i got a deal for the car for under 700$
 

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1991 500SEC 55K mi. 1987 560SEC Now 153K mi. 2020
Joined
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5,461 Posts
Hi Aaron,

Yes, you did say bottom of the tank..

More goodies from the MB CDs for you.

Cheers, MBL
 

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Registered
1983 Euro 500SEC AMG, 83 SEC custom convertible, 2x 84 500SEC, 02 w203coupe, euro 1985 300d
Joined
·
1,579 Posts
Discussion Starter · #7 ·
ok it is the return flow hose that goes into the steadying bowl/seperating chamber if I have one in that tank?? (found my wis cds! pic 47.0714-010/1)

I guess it is plugged pretty good---I cant seem to force any water or air into that return
what psi does the gas return to the tank at?????? last question on this pointless topic i promise!
 
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