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  #1  
Old 09-20-2017, 03:41 PM
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77 450sl fuel in cylinders

77 450sl fuel filling cylinders. New fuel distributor, new fuel tank, new fuel pump, new fuel filter, flushed lines, new injectors,new fuel regulator, new plugs. With fuel pump disconnected it will run on carb cleaner. Will not run on fuel pump. Any ideas or where to go from here. Keeps filling cylinders with fuel.
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Old 09-20-2017, 04:57 PM
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What is the history of this car?

Did you pull the injectors, operate the fuel pump to see if that is where the fuel is coming from? ( remember fire hazard when doing this . )

If the air flow plate does not return fully, it will spray fuel from the injectors when the engine is stopped.
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Old 09-20-2017, 05:48 PM
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Bought on the cheap sitting garaged. It was full of bad fuel. Fuel system was full of debris, begin replacing fuel components. Replaced tank, flushed lines, replaced fuel distributor, regulator, injectors car attempts to run, but floods out. Engine does not like to run with fuel pump connected as in electrical connected to feel pump. After fuel distributor replaced, fuel dumping in cylinders. Replaced injectors today thinking some were hung open. Fuel is still being dumped into the cylinders. It's really clean, it just sat with fuel in the tank for too long. I'm not that familiar with this car. What seemed like a good buy is slowly turning into a money pit
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Old 09-20-2017, 05:49 PM
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Air fuel plate does return
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Old 09-20-2017, 05:50 PM
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Also fuel distributor was previously leaking into top of throttlebody that's why I replace the fuel distributor. Fuel distributor isnt leaking anymore. If you was from the injectors.
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Old 09-21-2017, 10:43 AM
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what are your fuel pressures?
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2011 Porsche Cayman - Bond,James Bond
99 E320 THE Queen Mary
62 220b - Dolly - Finally my Finny!
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
07 Lexus RX 350 - Lexi
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #7  
Old 09-21-2017, 03:11 PM
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Line into fuel distributor is 60 psi key on. Drops and holds at 40 psi. Line at warm up regulator inlet is 55psi. And return 55 psi. Trying to check at an injector line as I type.
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Old 09-21-2017, 03:12 PM
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Pretty sure it's too high but I don't know why.
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Old 09-21-2017, 03:26 PM
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I wonder if thefuel distributor regulator is set too high
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  #10  
Old 09-21-2017, 04:48 PM
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Quote:
Originally Posted by Boggerj View Post
Line into fuel distributor is 60 psi key on. Drops and holds at 40 psi. Line at warm up regulator inlet is 55psi. And return 55 psi. Trying to check at an injector line as I type.
If there is 55psi in the line that is returning fuel from the warm up regulator (WUR) to the fuel distributor (FD), that is the likely cause of the flooding.
The pressure in the WUR return should be close to atmospheric, i.e., zero (gauge). High pressure in the return suggests a blockage in the return lines, or possibly a sticking check valve in the internal fuel pressure regulator in the FD.
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Old 09-21-2017, 08:01 PM
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second Franks diagnosis and why I asked. PM me your email and I will send you some info on pressures .
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Ron
2011 Porsche Cayman - Bond,James Bond
99 E320 THE Queen Mary
62 220b - Dolly - Finally my Finny!
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
07 Lexus RX 350 - Lexi
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #12  
Old 09-21-2017, 08:09 PM
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Quote:
Originally Posted by Boggerj View Post
Replaced injectors today thinking some were hung open.
The injectors on this car act like diesel injectors ( a spray nozzle and valve that prevents flow until fuel pressure rises. ) If the check valves had hung open, it would run fine but fuel would dribble out when engine is off.

Quote:
Originally Posted by Boggerj View Post
What seemed like a good buy is slowly turning into a money pit
So far you have replaced typical "stored with old fuel" parts however, diagnose and not just throw parts at the car.
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