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Got a 2009 mack gu713 when it gets hot and you shut it off…

Got a 2009 mack...

Got a 2009 mack gu713 when it gets hot and you shut it off will crack for every and not start again only when hot not building fuel pressure let sit for awhile and cool off starts right back up

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

2009 mack graniter gu713 mp8 v-mac 5

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Answered in 10 minutes by:
10/2/2017
Technician: Wayne, Journeyman replied 4 years ago
Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 17,650
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
Verified

Hi i'm Wayne

I will help you with this

did you replace fuel filters ??

will it start with starting fluid ??

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Customer reply replied 4 years ago
replaced fuel filter twice replaced fuel pump and fuel filter housing haven't tried starting fluid don't like using that
Technician: Wayne, Journeyman replied 4 years ago

HI

Yes I do not like to use it either

but give that a 1 time try

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Customer reply replied 4 years ago
doesn't make any sense because when it cools off it fires right up and I am not getting any codes and runs fine
Technician: Wayne, Journeyman replied 4 years ago

Hi

That is why want to see if it starts up with stating fluid

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Customer reply replied 4 years ago
had codes before I started working on fuel system for short circuit to the diff. pressure sensor fixed that and had to replace bad egr valve but when truck gets hot fuel pressure jumps all over the place and you shut it down with not restart unless you hand prime the shit out of it until it cools off then fires right uptrying starting fluid now
Technician: Wayne, Journeyman replied 4 years ago

OK, Let me know

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Customer reply replied 4 years ago
first time long crank fired up with starting fluid wouldn't stay running. second time tried again and kept giving it either it caught and stayed runningshut it off and started back up on its own like it loses fuel prime when hot not making any sense
Technician: Wayne, Journeyman replied 4 years ago

HI

Thank you for that

Ok it is losing prime , that fluid proved it

I would install a 1 way check valve at the filter head

I hope this helps you

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Customer reply replied 4 years ago
before or after head
Technician: Wayne, Journeyman replied 4 years ago

Hi

At the inlet side of the filter

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Customer reply replied 4 years ago
what kind of psi rating should valve have
Technician: Wayne, Journeyman replied 4 years ago

HI

The pressure rating would not matter

just that it holds the fuel from running back

Hi. If this helped you

Please rate my answer 4 or more stars.

That is the only way I get credit for the question

or the money you paid stays at JA and I get nothing for my time.

If you need more info use the REPLY button

Not the Poor/Bad service.

Wayne

Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 17,650
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
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Wayne
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Wayne, Journeyman
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