New 5.7 runs and shuts off

[Chrisw87]

Where is it located

 

[Scott Danforth]

New fuel pump. And checked all the lines to make sure nothing has stopped up new fuel filter,regulator and all. When i throttle up on it it just kinda stalls it stays running soon as I back off of it.

Check your fuel pressure.

You could have a plugged fuel vent or sticking anti-siphon valve.

Start trouble shooting

 

[dubs283]

Normally on the rain hat/flame arrestor cover along with engine serial number and other spec info

Guessing with the replacement long block there's little chance the serial number tag on the block is present

 

[Scott Danforth]

880 block is the 1996-1999 / 2000 vortec block with roller cam

 

[Chrisw87]

Does this help it’s from the old engine but should be the same cause we ordered the motor by these numbers

 

[Chrisw87]

This also was the old engine

 

[Chrisw87]

I ran it today with a 5gal tank in the boat and it done the same thing

 

[Chrisw87]

I’ll ck the pressure tomorrow thanks

 

[Chrisw87]

Ok I checked the fuel pressure and I’m getting 38 to 39 from my understanding it’s sopposed to be around 30 any ideas

 

[Chrisw87]

Checked the fuel pressure and it’s 38 to 39 psi

 

[alldodge]

Checked the fuel pressure and it’s 38 to 39 psi

Your high, it's probably flooding.
Remove the FP Reg on the cool fuel module (item 15) and check the screen under it. If it gets clogged it will increase pressure

https://www.mercruiserparts.com/bam/subassembly/31886/4856/90

 

[Chrisw87]

I took all of that apart yesterday and everything is clean

 

[Chrisw87]

I took all of that apart yesterday and everything is clean

And all that is new as well

 

[alldodge]

You should see 30 psi so something is making it high. The Reg being new, are you sure it's a 30 psi and not maybe 40? Either that or maybe the gauge is off

If you have a air compressor and air Reg can bench test the fuel Reg

 

[alldodge]

Merged

 

[Chrisw87]

I unhooked the return hose that comes from the fuel regulator to the fuel filter and turn key on gas came out. That would mean that the regulator is working correct. Sorry for all the ? But new to this.

 

[alldodge]

I unhooked the return hose that comes from the fuel regulator to the fuel filter and turn key on gas came out. That would mean that the regulator is working correct. Sorry for all the ? But new to this.

Yes

 

[Chrisw87]

Ok one more ? Could the new fuel pump be a higher psi than the old one

 

[alldodge]

No, but even if it was the Reg should limit pressure to what it's set at.

There is a color ring usually where the vacuum hose connects. What color is it?

 

[Chrisw87]

Ok one more ? Could the new fuel pump be a higher psi than the