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#1
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Checking fuel accumulator
I'm checking the fuel accumulator on a 1979 450sl due to a no start when hot condition. I was told to remove the hose from the back of the accumulator to see if fuel runs out. Well, not only did fuel run out, but kept coming and coming. Wondering if I pulled off the correct line. THis hose comes off the accumulator, then tees back to the filter via check valve, and back to the damper assy. Just looking at the schematic, looks to me like it should have fuel. Was I mis-informed, or do I have a bigger problem. THanks for any info!!
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#2
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To test the accumulator you must clamp OFF the end of the hose that goes back to the damper.
Then after turning the key on/off several times no fuel should come out from the accumulator nipple.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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That makes more sense. I'll test it again. Thanks!
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#4
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K Jet - Engine will not start Warm check all of these issues
1. Air flow sensor plate not adjusted correctly: Remove the boot and the air filter and check the position of the plate as compared to the barrel. The plate should be even to the bottom of the barrel, a tolerance of +/- .020 is allowed. You can adjust the plate: 1973 ½ - 1975 by bending the clip and 1976- 1983 by adjusting the screw with an allen screw driver. The screw driver is put m at the top of themixture control unit through a hole. 2. Fuel pressure is not correct: Check fuel pressure at the fuel pump. 3. Cold Start valve leaking: Check the cold start valve by removing the part from its location. Leave the fuel line connected. Remove the connector, place the valve over a container and apply voltage toon of the connectors and a ground to the other. Look for a coned shaped injection of fuel.Turn off the power and wait a few seconds. Watch for leaks. If either of the above doesnot work, replace the valve. 4. Vacuum Leaks: Carefully inspect the complete engine for any cracked or worn hoses.Look for connections that may be loose or have come loose. 5. Control Plunger in Fuel Distributor binding: Check this by first depressurizing the fuel system. Do this by relieving the fuel pressure at the warm up regulator. Remove the fuel filter and carefully move the plate up and down. This movement should be free and with no binding. If you detect binding, replace the fuel distributor with a rebuilt unit. 6. Fuel Accumulator and/or Fuel Pump Check Valve: These hold pressure in the fuel system. 7. Fuel injector Clogged: Pull the injectors and inspect for correct operation. Apply power to the fuel pump, jump the wire terminal numbers 30 and 87a. Caution fuel will flow from the injectors when the air flow plate is moved in an upward direction. Check for correct operation. 8. Control Plunger in the fuel distributor binding: Remove the air cleaner and carefully move the plate up and down, do not force the plate. If it binds investigate. If it is not simple to repair replace the unit. 9. Idle speed, Ignition Timing, and mixture out of tolerance: Check and adjust all of the above. 10. Faulty Ignition System: Check the ignition system.
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 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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