Engine will not stay running

Hi,

I have very little tech info on this vehicle because of the model year. However, if you have fuel pressure, are you getting an injector pulse? Take a look through this link and see if it helps:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Let me know.
Joe

Hi,

Sorry about that. I found an old technical service bulletin you may find of interest dealing with the fuel distributor. Take a look through it and see if anything helps.

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1976 Mercedes Benz 450SL V8-4.5L VIN 117.985 FI
Fuel Distributor - Updated MY 1980
Vehicle Powertrain Management Technical Service Bulletins Fuel Distributor - Updated MY 1980
FUEL DISTRIBUTOR - UPDATED MY 1980
BULLETIN NUMBER:
07.3/25

DATE:
August, 1981

SUBJECT:
REPLACING CAST-IRON CIS FUEL DISTRIBUTOR WITH LIGHT ALLOY VERSION
FOR ENGINES 100.985, 110.984/985, 117.985/986

After our inventory of cast-iron fuel distributors is exhausted, only light alloy replacements will be available.

Please note that up to model year 1979, a cast iron fuel distributor was installed in production, which, in case of repair, is replaced with a light alloy version. Starting with model year 1980, a modified light alloy fuel distributor was installed in production, which cannot be interchanged with the pre-1980 model year light alloy (spare part) fuel distributor or vice versa.

Spare Parts

Name Engine Part No. Fuel distributor 110.984 110.985 000 074 08 13 100.985 117.985/986 000 074 03 13

Note:
If rust or water is found in the CIS (continuous injection system) during repair jobs, in addition to replacing the fuel distributor, the following corrective measures must also be taken.

1. If a substantial quantity of water or rust is present, drain fuel tank and check strainer in tank.

2. Remove and drain the fuel accumulator and blow out with compressed air or replace (see Service Information 07.3/21).

3. Replace fuel filter and install new corrosion resistant suction damper in front of fuel pump (in production since October 1978).

4. Replace cast-iron fuel distributor with light alloy version.

5. Replace fuel pressure damper (located between fuel distributor and warm-up enrichment compensator) and fuel line with fitting, new part No. 000 074 4886 (in production since 1980 M.Y.).

6. Blow out the fuel lines with compressed air.

7. Before operating the engine, fill one or two quarts of ethyl-alcohol ("dry gas" etc.) Into the empty tank, then refill with clean fuel.

8. Check primary system and control pressures. If control pressure is excessively high, replace warm-up enrichment compensator.
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Let me know.

Joe

You are very welcome. I hope it helps. Let me know if you have other questions or need something.

Take care,
Joe