There are no cons. Low fuel pressure at WOT kills injectors plain and simple. Tie a rope to the top rad hose to pull it out of the way a little, disconnect the intercooler outlet at the elbow and rotate it up out of the way, grab a #27 Torx. It'll take you 15 minutes tops to put it in.
Just do it, and 6.4 banjo's at the same time. From the dealership I paid like 80 bucks for the blue spring kit, banjo's, and washers for my mamma's 6.0 excursion lol
thanks guys hey while we are here i see a kit that comes with a houseing and one with just the spring, bolts and gaskets which one should i get? or does it matter
Don't need a new housing. Just undo the bolts replace the gasket and spring. If you do it like I do you don't need to touch the fuel lines which are easily twisted.
Below is a schematic of the fuel supply for a 6.0L. The banjo's (check valves is what they are called on the 6.0) are circled in yellow. I circled the housing for the spring in red.
Next is a comparison between the stock check valves (on top) and 6.4 banjo's. Notice the size of the openings for fuel to run through.
Check valve on the right, 6.4 banjo on the left. NO restriction.
Find the fuel filter housing under the hood, at about 5oclock on that with be a small housing bolted to the side vertically with 4 black torx bolts. Undo those and you will see the spring, simply put new spring and gasket on and bolt it back up
Doing mine and wondering where the black plastic piece goes, it didn't come out of the old one. Was it not part of certain years mines an 06? It doesn't seem to fit were the diagram shows it to go either.
I have an 06 also, I couldn't find a use for the black piece either (it's till on my workbench).
Before installing the spring I was getting about 50 psi at Wide Open Throttle. I get 65 at idle and 65 at WOT now, although I've replaced both the factory steel fuel lines that run from the secondary fuel filter to the heads. These lines eliminate the banjo's at the heads.
I also took off the banjo bolts on the secondary fuel filter housing for the steel lines that go to and from the fuel pump, and drilled them out. I probably added 30% more area for the fuel to flow.
I reassembled mine without it and it seems to run fine, just need to get a fuel pressure gauge. I replaced my banjo's with 6.4's and saw an immediate difference.
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