Found a Napa Autotech Article on Fuel Pressure

cvma544 · #1 (**permalink**) 11-29-2011, 01:40 PM

U235a4 · #2 (**permalink**) 11-29-2011, 02:50 PM

I found this interesting on the head banjo bolts from the PDF

"The fuel supply line on the front of both heads has a banjo bolt with a flow valve in it. This valve can restrict with contaminants. All 4 cylinders on the bank will have low power or misfire concerns. To verify the concern, check fuel pressure at the back of the head involved."

cvma544 · #3 (**permalink**) 11-29-2011, 03:25 PM

Now I am far from even being considered a novice on diesel engines, however since flow and pressure are what one wants, and it does have a valve, a check valve to prevent bleed back I suspect, why couldn't someone like me put them up on a mill and open the holes up and let them flow more but not damage the valve?

It would reduce the chance of clogging, and let more volume to the fuel rail but still use the check valve to prevent back flow, used in combination with the blue spring kit would this not make more volume and pressure available for the injectors?

***sinner6.0L*** · #4 (**permalink**) 11-29-2011, 03:44 PM

I doubt bleed back is an actual concern considering the 6.0 fuel system is deadheaded. The check valves are there to reduce pressure fluctuations in the fuel rail. LIKELY this is for the VT365, which I understand uses a mechanical fuel pump. Obviously a mechanical pump isn't going to have a steady output of pressure like the the HFCM does on our trucks

cvma544 · #5 (**permalink**) 11-29-2011, 03:53 PM

Quote:

Originally Posted by sinner6.0L

I doubt bleed back is an actual concern considering the 6.0 fuel system is deadheaded. The check valves are there to reduce pressure fluctuations in the fuel rail. LIKELY this is for the VT365, which I understand uses a mechanical fuel pump. Obviously a mechanical pump isn't going to have a steady output of pressure like the the HFCM does on our trucks

Then since the heads have a rail plug at the rear wouldn't a cross over line from the rear of the heads equalize any possible differences between the left and right fuel rails/heads/banks?

bismic · #6 (**permalink**) 11-29-2011, 03:57 PM

Good find - thanks!

**sargar** · #7 (**permalink**) 11-29-2011, 04:05 PM

Quote:

Originally Posted by cvma544

THANKS FOR SHARING.

***sinner6.0L*** · #8 (**permalink**) 11-29-2011, 04:12 PM

Quote:

Originally Posted by cvma544

Then since the heads have a rail plug at the rear wouldn't a cross over line from the rear of the heads equalize any possible differences between the left and right fuel rails/heads/banks?

I don't see a real benefit to this but there is so little space back there to begin with. The pressure differences aren't from bank to bank but occur when one injector removes pressure in that rail before the pump gets it back. With an electric fuel pump I can't see this being much of an issue

It'd be almost impossible to get a line past the egr cooler up-pipe flange anywhere

cvma544 · #9 (**permalink**) 11-29-2011, 04:43 PM

Quote:

Originally Posted by sinner6.0L

I don't see a real benefit to this but there is so little space back there to begin with. The pressure differences aren't from bank to bank but occur when one injector removes pressure in that rail before the pump gets it back. With an electric fuel pump I can't see this being much of an issue

It'd be almost impossible to get a line past the egr cooler up-pipe flange anywhere

Thanks, like I said I don't know enough to be a novice yet.

Stu

bismic · #10 (**permalink**) 11-29-2011, 06:12 PM

Nice links, but be aware that there are a few errors in the articles. For the EGR System Testing article, they mention that "on early 03 engines, check for EBP sensor bias/carbon build up. Later than 03 will ignore the EBP for Turbo control". In fact the "inferred EBP strategy" is for the 03 and early 04 engines. That same article talks about the degas bottle cap rating as 18 psig and I am pretty sure it is 15 psig (new cap anyway).

Another article (Fuel Pressure Testing) mentions the minimum fuel pressure as 38 psig, and in fact Ford states that it is 45 psig.

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