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Answered in 11 hours by:
9/20/2015
Mercury Mechanic: Matt, Engineer replied 2 years ago
Matt
Matt, Engineer
Category: Mercury
Satisfied Customers: 22,460
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
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Hello

this sounds like a lack of fuel and could be a lack of fuel pressure from the electrical pump at the tank.

If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the injectors and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.

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Customer reply replied 2 years ago
This is not the problem at all. I guess I did not explain it properly. I turn the key and engage the starter. The car starts while I hold onto the switch and let it turn back a bit to disengage the starter. The car runs fine while am holding onto the key. The car stays running until I fully release the ignition switch into the run position. Then the engine dies.
Mercury Mechanic: Matt, Engineer replied 2 years ago

Thanks for the extra information

OK this sounds like the fuel pump isn't being held on by its relay

this relay is normally switched via the ignition switch and the relay held on once the engine is running

so I'd suggest replacing the fuel pump and the ECU relays that shoudl be located in the engine bay fusebox

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Mercury Mechanic: Matt, Engineer replied 2 years ago

Hi

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Matt, Engineer
Category: Mercury
Satisfied Customers: 22,460
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Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.

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