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  #1  
Old 06-25-2004, 12:32 AM
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Join Date: Jun 2004
Location: Dallas,TX
Posts: 6
Question 300E starting problems!Need help!

Since my 1987, 300E died on me, a couple a months ago, i can't get it started again.At the begining i was thinking I will put new spark plugs, wires, distributor cap and rotor, fuel filter, so it will help, because most of it was old, i mean this parts, but it did not help at all.
I got it by three dif. mechanics since then, and finaly the fourth one thinks he knows what it is.
He sad that is sending to much fuel, so i found new fuel pressure regulator, and fuel distributor.
Still the same, engine full of gas.
He can get it to start, but sending to much gas again.
Finaly, he checked the fuel pressure, and it's 150 pounds.
How much needs to be, and wyhat needs to be done.
Please help me, i invested to much money in this car!
My e-mail adress is hasibomeragic@sbcglobal.net!
Thanks!

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  #2  
Old 06-25-2004, 09:13 AM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,318
Assuming that the pressure is being measured with the right tools at the fuel distributor, that's 'way high. The spec is 5.3-5.5 bar.

Maybe the return line is blocked?
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #3  
Old 06-25-2004, 01:35 PM
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Join Date: Jun 2004
Location: Dallas,TX
Posts: 6
Question 300E starting problems!Need Help!

Hi Chuck!
You sad return line maybe blocked.
Could it be anything else than the line?
How i check that?
This mechanic got to know that, i hope so!
Anyway thanks a lot Chuck!
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  #4  
Old 06-25-2004, 01:54 PM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,318
Your new regulator could be bad (unlikely).

The fuel pump could be going crazy (unlikely).

I don't have my 300E anymore, but I would think that you would unhook the fuel return line at the tank, stick the end in a suitable container, run the pump for 10 seconds by bridging the fuel pump relay, and see what comes out. If mechanic 4 can't do this, time for mechanic 5.

Suggest not smoking during test.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #5  
Old 06-26-2004, 12:17 PM
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Join Date: Jun 2004
Location: Dallas,TX
Posts: 6
Thanks for the info. Chuck!
I will go and talk with my mechanic today, see if he allready checked the ovp and the f.pump relay!
Thanks again Chuck!

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