Too much fuel pressure?
05-19-2007, 07:39 PM
#1
Administrator/Jarhead
Thread Starter
Too much fuel pressure?
I have had a walbro 392 on for a while, and I'm running 27-28 lbs at idle, 21-22 at WOT. Is that too much fuel pressure? Do I need to turn the thing down?
The only time that I've seen less than that is when I was almost out of fuel, and I think that it was sucking a little air. Other than that, it stays above 20.
TIA!!!
Mad...
The only time that I've seen less than that is when I was almost out of fuel, and I think that it was sucking a little air. Other than that, it stays above 20.
TIA!!!
Mad...
05-23-2007, 08:14 PM
#4
Registered User
Join Date: Jun 2004
Location: Edmonton, Alberta
Posts: 1,245
Likes: 0
Received 0 Likes
on
0 Posts
it allows the CP3 too regain the pressure in the rail more quickly, only bad part is I think you have too pull the relief valve.....I am not 100% on this one though!!
05-23-2007, 09:04 PM
#7
DTR's 'Wrench thrower...' And he aims for the gusto...
Join Date: Oct 2003
Location: Smith Valley, NV (sometimes Redwood City, CA)
Posts: 2,668
Likes: 0
Received 3 Likes
on
2 Posts
There is some concern about blowing the plastic lid off the fuel filter housing when you get over 30 PSI. It might be a good idea to get the billet lid from Genos. I did and it's very nice. If you clog the filter the pressure can go WAY up. The best way to prevent that might be another relief that connects the Walbro output line to the return line. This could be set at a pressure higher than the relief at the CP3 but lower than the lid blowing pressure.
Wetspirit
Wetspirit
Trending Topics
05-23-2007, 10:09 PM
#9
Registered User
Join Date: Oct 2006
Location: Harpers Ferry WV
Posts: 1,641
Likes: 0
Received 0 Likes
on
0 Posts
i have been running 28 psi now for about 5 or 6 months now and haven't had any problems with it just seems to run better with it turned up since the rail can recover quickly.
05-28-2007, 08:43 PM
#11
Administrator/Jarhead
Thread Starter
06-22-2007, 11:37 PM
#12
Registered User
Join Date: May 2007
Location: Camp Pendleton, CA
Posts: 258
Likes: 0
Received 0 Likes
on
0 Posts
06-22-2007, 11:44 PM
#13
Registered User
Join Date: Jan 2007
Location: Home of the Beaver
Posts: 685
Likes: 0
Received 0 Likes
on
0 Posts
The 392 pump kit comes w/ a bypass tuning kit(pressure) There are 2 springs and 3 shims. The heavier spring will increase pressure...with the addition of the shims you make 40psi~.
The bypass valve is mounted on the frame rail near the pump.
Make sure you install the bypass valve the correct way!
The bypass valve is mounted on the frame rail near the pump.
Make sure you install the bypass valve the correct way!
06-23-2007, 01:14 PM
#14
Registered User
For you guys with the OEM in-tank LP, are you experiencing loss of pressure to the CP3 or in the rail at WOT with heavy fueling?
We were expecting some fuel delivery issues with the '05, but so far nothing but good news with everything set on "kill".
We were expecting some fuel delivery issues with the '05, but so far nothing but good news with everything set on "kill".
06-23-2007, 04:44 PM
#15
Administrator/Jarhead
Thread Starter
The 392 pump kit comes w/ a bypass tuning kit(pressure) There are 2 springs and 3 shims. The heavier spring will increase pressure...with the addition of the shims you make 40psi~.
The bypass valve is mounted on the frame rail near the pump.
Make sure you install the bypass valve the correct way!
The bypass valve is mounted on the frame rail near the pump.
Make sure you install the bypass valve the correct way!