6.2L black smoke and gas in water
#14
Registered
Join Date: May 2004
Location: Okanagan Falls BC. Canada
Posts: 596
Likes: 0
Received 1 Like
on
1 Post
Before you start throwing money towards parts, remove the plastic cover from the cool fuel exchanger assembly. Remove the two screws that's holding the fuel pressure regulator[ controls excess fuel return to the water separator] on the copper exchanger and discard the s/s filter that sits under the regulator.What it seems in your youtube video ,your pressure spikes up [ hence the black smoke ] too high when throttle applied, dumping excess fuel through one or more injectors. If you have twins, you can start swapping the regulators at the top of intake first before diving into the cool fuel system below.
#16
Registered
Join Date: Oct 2000
Location: Spicewood, Texas USA
Posts: 1,382
Likes: 0
Received 3 Likes
on
2 Posts
You must disconnect the vacuum line to the regulator to get an accurate reading. The gauge is fluctuating because of the varying vacuum as you rev the engine. The regulator is passing the most fuel at idle. If the regulator was the issue it would be most prevalent at idle. Also, the regulator on the cool fuel is what controls pressure. The one on the fuel rail just acts as a damper.
Bob Lloyd
Full Throttle Marine
Bob Lloyd
Full Throttle Marine
#17
Thanks for the info Bob, do I need to pull both vacuum lines or is the cool fuel vacuum enough to get an accurate reading? I didn't record it, but when I pulled the cool fuel vacuum line the fuel pressure didn't change. Anything else I should be trouble shooting?
#18
Registered
Join Date: May 2004
Location: Okanagan Falls BC. Canada
Posts: 596
Likes: 0
Received 1 Like
on
1 Post
Last edited by spectras only; 11-06-2012 at 12:53 AM.
#19
Registered
Join Date: Oct 2000
Location: Spicewood, Texas USA
Posts: 1,382
Likes: 0
Received 3 Likes
on
2 Posts
What is the serial number on your engine? Some of the earlier 6.2L ran different regulators and lower fuel pressure. Maybe someone replaced it with the wrong one. Compare the fuel pressure reading with your other engine. Is your fuel pump under the engine or the module on the side? You need to unplug the hose running to the regulator at the fuel pump.
#20
She is 0w063672. What is the spec for that serial?
I am not actually sure where the fuel pump is, I need to look around a little more to find that out. Sounds like I got another good list of troubleshooting to do this weekend.
I am not actually sure where the fuel pump is, I need to look around a little more to find that out. Sounds like I got another good list of troubleshooting to do this weekend.