I drive an '04 3500 Dually that has 9974 miles on the clock. It also is
equipped with a full Banks kit and triple gauges on the A Pillar. Last week
, while driving using heavy throttle and the engine pulling hard, there was
a severe engine stutter. This was not a miss fire, it was like no power at
all for maybe 1 revolution. I lifted my foot. No error codes. Engine
completely recovered and the truck drove as normal. I tried the same thing
again, no problem. On Saturday, using heavy throttle again I saw the fuel
pressure gauge drop from its normal 6 PSI to 2 PSI and I lifted my foot and
the pressure immediately returned to 6 PSI. Sunday I changed the fuel filter
and all is normal again. The observation is this. Had I not had the fuel
pressure gauge installed, I could have easily trashed the high pressure
common rail pump by allowing it to cavitate. There apparently is no low fuel
pressure detection with this truck. Undoubtedly, this is the cause of so
many pump failures we all hear about. So BEWARE. We all know periodic
replacement of fuel filters is not sufficient to avoid this problem. It only
takes one bad tank of fuel to clog the filter. I highly recommend the
installation of this gauge and a spare filter under the seat. Mine just paid
for itself in spades.
Well, yes, but no. The 2nd gen trucks, '98.5 to '02, with the VP44 pump are
very sensitive to lack of fuel. The CP3 pump on the common-rail trucks is
much more tolerant of low fuel pressure, and failure of these pumps have
been very few and far between, compared to the VP44 failures.
However - you just found out how barely adequate the stock fuel pump is for
these engines. When adding power upgrades that deliver more fuel, you
really need to do something about the fuel system to keep the CP3 fed with
fuel. I would highly suggest one of the available pusher pump kits for your
truck. A normal running pressure of 6psi doesn't leave a lot of room for
error. To compare, I run a FASS system on my truck, which idles at 17psi,
and at WOT with about 600HP, won't drop below about 12psi.
I have considered a FASS, but I have no experience myself with one. Since
you now run one, you must have done some homework on which one delivers the
most bang for the buck. I have been playing with the simple idea of using a
commercial pump a strainer and a fine particulate large capacity filter. I
believe I can find these as new old ex military stock locally as an
alternative solution. I think half the problem is line size. It really is
too small. Please enlighten me with your experiece. I don't particlarly want
to reinvent the wheel.
Without question, the stock lines/banjos are pretty restrictive. Most
pusher pump kits come with replacement lines and AN fittings, replacing the
stock (5/16"?) lines and banjo bolts. Originally, I went with a kit from
Diesel Dynamics, which removed the stock lift pump and replaced it with a
Carter pump mounted on the frame rail. Larger lines were used, and the
banjos eliminated. This worked fine for a while, but the pump was very
noisy, and I was noticing a gradual decrease in fuel pressure delivered to
the injection pump.
I liked the FASS for it's larger filters, easier to change (they're the
spin-on variety), easier-to-access water drain, the availability of a 3
micron filter (the ones available for the stock filter canister are 10
micron), and easier to service should the need arise. It's very easy to
adjust the delivered pressure up or down, by simply removing a plug and
changing a spring (the manufacturer has various springs available). Of
course, it's ability to remove air from the fuel is it's big claim to fame,
and is more beneficial on a 1st of 2nd gen truck, as any air in the fuel
acts to retard injection timing (since the injectors are fired by hydraulic
The one downside to the FASS, that I don't like, is you can no longer fuel
the truck while it's running. The reason is the FASS draws a LOT of fuel
from the tank, and returns most of it. The return line gets plumbed into
the filler neck vent. Because of this, putting fuel in through the filler
neck creates positive pressure in the vent, which will spit the fuel that
the FASS is returning out of the filler neck.
The solution to this is simple... install another return directly into the
tank, and use that for the FASS return, leaving the filler vent free. Once
I get the proper motivation, that's what I'm going to do (drain/drop tank,
drill new hole, mount fitting, clean out plastic shavings, re-install).
Hope that helps out some...
You may have your work cut out for you adding another port to that tank.
Mechanical fasteners of any variety will not hold in plastic. The only way
to make this work is to have an internal metal plate for the flange
fasteners to clamp against. If you are lucky, there may be enough available
real estate in the factory port flange. Thanks for the advise. I believe you
are correct and I have no other choice except make this mod. I'll start
gathering bits and pieces now. On pump noise, all pumps are noisy. I will
try to use rubber isolation on the mount.
The company that makes the FASS does exactly this for their '05 kits. Since
the '05 trucks have a factory in-tank pump, they have you install a new
suction tube in the tank. The bulkhead fitting has a backing nut and
gaskets, etc. You can see it in their installation instructions:
I can't hear the FASS unless I'm outside the truck standing next to it.
With the Carter pump, even with it's rubber isolators in the mounting
bracket, I could hear it over an idling engine inside the cab.
I'm running an ATS Stage V trans:
http://home.earthlink.net/~tlawrence5/trans/trans1.html - Initial
http://home.earthlink.net/~tlawrence54/trans_teardown.html - Minor repair
List of mods? Let's see if I can get these in order:
Gauges - pyro, trans temp, fuel pressure
Air box - Scotty Ram Air III
Turbo Air Guide
4" exhaust w/ Aeroturbine
DD pusher pump kit
DD Jammer turbo, ATS manifold, DD air box
ATS Stage V tranny
TST PowerMax - at this point, dyno'd at 490RWHP
Upgrade fuel pump to FASS system
Banks High Ram intake - mainly because it looked cool :)
Upgrade to twin turbos -
Added boost, oil, and water gauges
Re-flash TST to twins program
ATS Billet flex plate
I think that about covers it (I assume you don't care about all the
non-power-adding crap :)
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