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2004 mack cx613 vision



Needing some help on this truck. 

First the truck started out as not starting while the engine was at operating temperature now it doesn't want to start when cold. A little starting fluid will start it hot or cold. After the first start it doesn't matter if it runs all day or 15 minutes it will not restart on its own without spray. Trucks runs normal after it starts. This is the al engine or whatever the right term is for it. There is fuel in the davco filter check valve is holding. Replaced the return fitting with the check in it on passenger side of engine. Fuel pump possibly? Just need some places too look for the problem. Thanks.

Edited by Playinghooky13
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What is low side fuel pressure while cranking the engine? What happens if you pump the primer pump while trying to start the engine ? And lastly is it just a davco filter or does it have the davco plus another filter on the truck ? 

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