Be careful when doing the original LCR Mod on your lift pump... I did this and ended up with some major power loss and studder issues.. I chased this problem for a long time... Was thinking at first something wrong with the tune, then with the fuel filter, then the lift pump.. was even considering changing out the injectors and the injector harness.. .Turns out the problem most likely was the kink in the green hose I installed ...
When I changed out the PD lift pump with an new unmodified Lift pump, the problem immediately went away.
After my initial test drive with the new lift pump, I examined the just removed LCR modded lift pump and I believe I may have identified the cause of the studder... A kinked hose ...When I first put this lift pump in, I did the original "LCR Mod" to it... i.e. added a check valve and bypass circuit in case the pump went bad ... however by looking at the green hose I have there, it clear that there is a good kink in it. Hose may have not long enough or not stiff enough.
Bottom line... If you do this mod, be careful how you run the tubing... Make sure you get stiff enough and long enough tubing so it will not kink. ...
DanG144 shows the tubing running much longer on his Lift pump mod DIY than I did mine so that method would be much better IMO. Mine was based on the original LCR mod and It was fine for a long time and I think the tubing originally kept it's rigidity and smooth trajectory. My theory is that over time, it got weaker and instead of staying stiff and making a smooth flow, it kinked and caused a major fuel flow restriction.
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When I changed out the PD lift pump with an new unmodified Lift pump, the problem immediately went away.
After my initial test drive with the new lift pump, I examined the just removed LCR modded lift pump and I believe I may have identified the cause of the studder... A kinked hose ...When I first put this lift pump in, I did the original "LCR Mod" to it... i.e. added a check valve and bypass circuit in case the pump went bad ... however by looking at the green hose I have there, it clear that there is a good kink in it. Hose may have not long enough or not stiff enough.
Bottom line... If you do this mod, be careful how you run the tubing... Make sure you get stiff enough and long enough tubing so it will not kink. ...
DanG144 shows the tubing running much longer on his Lift pump mod DIY than I did mine so that method would be much better IMO. Mine was based on the original LCR mod and It was fine for a long time and I think the tubing originally kept it's rigidity and smooth trajectory. My theory is that over time, it got weaker and instead of staying stiff and making a smooth flow, it kinked and caused a major fuel flow restriction.
P
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