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Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 14295
Experience:  Degree in Marine Technology. Gas and diesel marine mechanic.
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Is there a on/off switch or valve on the Volvo Penta MD7A?

Customer Question

Is there a on/off switch or valve on the Volvo Penta MD7A? I've been trying to start one that has been siting for 3 years and having no luck. I changed all the filters and oil. Sucked out the diesel fuel and add new. Blew out the lines for anything that mat have been stuck in them.
When trying to prime with the fuel pump lever it wont. The fuel won't even get to second fuel filter. We even topped that filter off prior to priming. We also were hand cranking the engine to no prevail.
I spoke to a friend who said there is should be a ON/OFF switch or valve that is holding us back. If there is can someone explain to me where, and if not any suggestions on starting this beast.
Thanks,
Frustrated
Submitted: 8 months ago.
Category: Boat
Expert:  Joe replied 8 months ago.

Hello,

Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.

"When trying to prime with the fuel pump lever it wont", I presume this has the mechanical fuel pump and that you have removed and are trying to manually work the arm? Disconnect tje output fuel line from the pump and with the pump arm being moved it should come out the output, if not there is a restriction, leak or bad fuel pump, with that said mechanical fuel pumps that sit for years are known to go bad and may need to be replaced. You can simply create a suction on the fuel pump input line and if you pull fuel with no loss and no air (once primed out) and nothing out would would then have shown the problem as the pump.

Thank you!
- Joe

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Expert:  Jason replied 8 months ago.

Hi Fred, my name is Jason.

The engine needs 2 things to run, compression an fuel. If it will not prime with the fuel pump lever chances are the fuel pump has a bad diaphragm, as it should be pushing fuel through it. These engines will run on WD40, and burn it as a fuel. So start by removing the air cleaner, have a helper turn the engine over, and spray WD40 into the intake and let me know if the engine will start and run on that or not.

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