silentsnow31802 Posted June 27, 2015 Posted June 27, 2015 Having my car tuned through Cryo. Been battling a loss of fuel pressure near redline for a while now. I have gone from a Walbro pump with all sorts of O-ring combinations to a DW65c and have had no luck. Recently installed a fuel pressure gauge after the regulator to see what its doing. I am getting about 32psi of fuel pressure at idle, 60psi of fuel pressure at about 20psi of boost then it goes down to about 55psi as it nears redline. I am starting to believe the pump is not the issue. Maybe its the regulator? I am unsure of how I would test the regulator separately from the pump. If anyone has any suggestions or anything please let me know. Its been a long time battling this and im ready for my tune to be finished. Here is a link to the video I made to send Cryo. Attached is also the latest datalog. https://youtu.be/CjNnpf6qLsgromraiderlog_20150620_061247.csv
GTTuner Posted June 27, 2015 Posted June 27, 2015 http://legacygt.com/forums/showthread.php/fuel-pump-control-module-143860.html
silentsnow31802 Posted June 27, 2015 Author Posted June 27, 2015 http://legacygt.com/forums/showthread.php/fuel-pump-control-module-143860.html Are those types of modifications standard for a dw65c pump? I thought pump voltage didn't become an issue until you got above the dw65c/Walbro 255 pump area. Sent from my C6916 using Tapatalk
GTTuner Posted June 27, 2015 Posted June 27, 2015 Read the thread, lots of owners had a problem with low voltage/voltage drop thru the FP module causing loss of fuel.
silentsnow31802 Posted June 27, 2015 Author Posted June 27, 2015 Read the thread, lots of owners had a problem with low voltage/voltage drop thru the FP module causing loss of fuel. Lots to read. Looks like voltage drop is more of an issue than I realized. I'll keep on reading and see what my options are. I'm a fan of a clean install so I don't like the idea of running wiring to the battery. Looks like a sti module will get me another. 2 volts. (phone won't let me put that period in the correct spot :-/) Need to figure out the wiring after that it seems like. Thanks for the help! Sent from my C6916 using Tapatalk
CapnJack Posted June 27, 2015 Posted June 27, 2015 Also you should make sure the hose from the manifold to the regulator is not leaking under boost. I had a similar issue with my external waste gate. Zip tie and superglue if you have to.
silentsnow31802 Posted June 28, 2015 Author Posted June 28, 2015 I will check the line as mentioned above. I ordered a sti fuel pump module and deatschwerks fuel pump hardware kit to get that extra bit of voltage to the pump. Sent from my C6916 using Tapatalk
05sleeper Posted July 1, 2015 Posted July 1, 2015 Mine ended up being the internal fuel filter in the pump housing. Previous tuner tried new pump, regulator, hardwired controller, new top feed conversion kit all with no avail till we replaced the filter in the housing. Just another thought if you're higher mileage.
silentsnow31802 Posted July 1, 2015 Author Posted July 1, 2015 Mine ended up being the internal fuel filter in the pump housing. Previous tuner tried new pump, regulator, hardwired controller, new top feed conversion kit all with no avail till we replaced the filter in the housing. Just another thought if you're higher mileage. I have tried a different fuel basket with a new pump and still have the problem. I'm going to try the wiring upgrade next. Hoping that works. If not I'll look into the internal filter as the original had 80k on it and the other is unknown to me. Sent from my C6916 using Tapatalk
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