I have had the GDP big line kit and 2 micron FF5320 on my truck since I lost the #5 injector a few months ago. I have aLL MY GAUGES EXCEPT the Fuel pressure. I was told by GDP that my stock pump would be fine on a stock engine to run the 5 micron in the Facotry location and the 2 micron kit...

I am getting some Injector clatter and posted about that on here last week. Most said it was normal and they got it too. This is just under load while accelerating. Once you back off the throttle slightly it goes away. Plenty of power, no smoke, Idling good etc...


I just want to rule out a Fuel pressure, starvation, issue as the cause of the clatter before I leave it alone and "Drive it like I stole it" LOL

For all of you with the same set up as mine and stock pump, are Fuel pressures OK?

 

I don't have the GDP kit, but i do have a fuel press guage at the input to CP3 and i just added a similar 2 mic filter (plus i have the baldwin 5mic in factory basket). I saw maybe .5 psi lower pressure when i added the new 2 mic filter, so i would say your filter does not impact the performance of your lift pump. The factory pumps are very weak however, even before i added the 2mic filter i only had 10psi fuel pressure and i can drop it 1 - 2 psi WOT, with a stock truck. My next upgrade will be a raptor pump that can maintain a constant 20 psi.

 

Thanks so much! Answered my question

 

Lift pumps and fuel pumps can all have some variance between them. Most who have installed a fuel pressure gauge report the stock fuel system at between 8 to 10 psi, a few people have reported 6 psi.

Many who have done power related mods have had to go to higher output pumps to keep up with fueling demands of their mods. If you tow heavy, the stock fuel pressure levels may not support your fuel demands, especially if you are one of those who has the lower fuel pressure levels at the 6-8psi range.

I have a fuel pressure gauge, installed it the first week I owned the truck. My pressure was at 12 psi when I installed the gauge. I lost a needle width of pressure after installing the 2-micron/big line kit and it has remained the same pressure since that time. That needle width of loss is not enough to really even call it a loss of pressure. I also run the Baldwin 5-micron in the stock canister.

To try to compare your truck's fuel pressure against everyone else is not really a good way of measuring things, too much deviation from truck to truck that does know their fuel pressure because they have gauges. You need to install a fuel pressure gauge, see what your pressure is running unloaded, then pulling you trailer loaded. You will certainly then know where you stand regarding the stock system function and your clatter under load/acceleration if you can pull your fuel pressure down to little or nothing.

CD

 

Thanks everyone! Thats my next step.. How difficult is it to install the FP gauge? I had my Boost and EGT done at the shop....

 

You just have to cut in that 'T" you got in your GDP kit, run a hose/line to a pressure regulator from the 'T', then mount your gauge, tap into the wiring/lighting on your other gauges, run a hose/line from the FP gauge to the pressure regulator and fill the line with anti-freeze.

I picked up a pressure regulator from where I purchased my gauges, mounted it on the engine firewall side. I hooked up the regulator side of the gauge hose/line going into the cab first, ran the line into the cab/a-pillar area filled it with antifreeze and connected it to the gauge. Then I did the a-pillar wiring and buttoned up the a-pillar. Went out to the engine compartment, cut in the 'T', routed hose/line to the regulator. Took about an hour maybe slightly less from getting tools together to job done. Easy to do.

CD

 

CD has a good point, i know my buddy only saw 7-8psi on his stock truck and he could bottom out the needle on zero WOT. Low press. fuel is the one and only guage i have added so far, a must have IMO. I installed mine in the same way basically, but CD has all the details for you GDP setup. I have plugged up a 2mic filter after running some spicey biodiesel and the only way i could tell was low press. on the gauge at idle, CP3 was able to suck enough fuel it ran normal.

 

Thanks all!! I certainly appreciate the help!

 

One thing about the T supplied with the GDP kit. Inspect it closely to see if there are any burrs or metal flashing left over from the machining process that may easily get into the fuel stream. Mine had a thin piece of aluminum at the very base of the threaded block. It was just ready to flake off and go to my CP3. All it took to fix it was to break it off. I did that and filed it a bit to remove any other burrs then cleaned the part.

Nothing wrong with this sort of thing as it can be expected from time to time. But be ultra clean and perform a close inspection of everything from the outlet of your 2 micron filter to the inlet of the CP3.

 

I have the same set up with a Baldwin 5 and a 2 micron Fleetguard GDP kit before the CP3. After I installed the GDP kit, I bumped the starter to purged the line with about 1 quarts of #2. I see anywhere between 7.5-9 PSI cruising @ 65 MPH. I could not speculate what the pressure will be @ WOT as I’m not brave enough to try it. My truck has an easy life, never towed anything and only seen 2,800 RPM once @ 4th gear. All my performance stuff is there “just in case”.