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allows more fuel to the injectors. and i have heard of it before but id make sure every tiny piece of metal is out. you dont want one going through an injector. and why 4 you only need to unless you have a regulated return. the one on the fuel bowl is big enough
you can buy them for $5.00 from ford. just get the ones for a 6.4. IMO its still a waste of $5.
I have these in hand but had seen a thread where you explained what the check valves do. Since I still really don't know and you still disagree with the mod, I guess I will just hold on to them.
I have these in hand but had seen a thread where you explained what the check valves do. Since I still really don't know and you still disagree with the mod, I guess I will just hold on to them.
I drilled mine out and removed the valves. Along with the banjo on the fuel filter housing(later models) and part of the fuel ports on the oil/fuel filter housing.