Question about 1989 Mercedes-Benz 300-Class

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Fuel not reaching engine

Im thinking of buying this vehicle owner says he replaced the fuel pump and the filter what elase could it be the car will start if you pour gas into the carburator

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How full is the tank? Some cars will take up to four gallons to restart the fuel pickup working.
Can you take the fuel line off the front and then see if it will dribble?
You can try to add a little air pressure to the tank and see if it has a leaking rubber gas line or connection.
With a pump that pulls fuel a leaking gas line can **** air instead of gas.
Some cars have more than one filter.
The pick up tube in the tank has a screen which may be clogged.
Let us know what you find out.

Posted on May 06, 2010

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Try the fuel pressure regualtor

Posted on May 06, 2010

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1 Answer

Location of fuel filter


Hi John, Im AL the owner of Big As Auto Repair.

John, I'll answer this the best I can not knowing what vehicle you have.

Fuel filters are placed in different places by the manufacture. Sometimes its under the hood behind the engine. Others place it on the frame rail near the fuel tank, BUT, almost all newer vehicles its mounted on the fuel pump inside the fuel tank. Hope this helps and please visit my auto-repair-website at:
http://www.bigasautorepair.com/

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the fuel pump is only designed to run until it reaches a preset pressure. once it reaches that pressure it turns off. One way I know to check it without dropping the tank is to remove the fuel filter. Put the fuel line in a gas can so you don't get gas all over. turn the key on if the pump keeps pumping fuel then it's not the problem. at that point I would buy a new fuel filter because it may be clogged and the reason no fuel is getting to the engine and they are inexpensive and a good idea to keep changed anyway.

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Although, it sounds like the choke isn't functioning properly. Once the truck has reached operating temperature remove the air filter and check to see if the choke is completely open. If that is functioning correctly i would check the timing. Which should be at 7* BTDC, although from personal experience with my own ram 50 (an '84 with a modified 2.6) I've found they run much better with the timing set to 9* BTDC.
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Try replacing the fuel filter. I would imagine it to be located under the car, inline with the fuel lines, otherwise consult your owners manual for the location.
Look for any broken ground wires in and around the engine compartment and possibly around the fuel tank itself. Could be dirty, corroaded, or just not making a good connection.
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You either have a clogged filter or fuel pump is bad. The filter is the cheapest to replace. You can do both yourself with common tools. Post if you need instructions.

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1 Answer

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Fuel Injector Pressure Regulator would be my next option. let me know if you need more help on the matter

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