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#1
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Fuel pressure drop.
At moment I'm trying to figure out why I'm losing fuel pressure once engine bay heats up(10-15 min driving)It's only small decrease 5-6 psi but enough to change Afr.
Plus doesn't hold fuel pressure after priming system.just drops to zero quickly. But car starts fine. I've only just ran new fuel lines,injectors, rails, fuel pressure reg, fuel pump, fuel filter. There's no fuel leaking anywhere. Doesn't sound like any vacuum leaks and manifold pressure looks about right. I've changed pump back to old walbro. Still same. I'm thinking fuel temperature is getting higher than normal, dropping pressure but that's just a guess. Fuel lines does have aeroflows silcon protection tubing. Has anyone had this problem before. ??? |
#2
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Fuel pump duty cycle is 100% at start. Drop to 33% after like one min later, so fp will drop 6psi accordingly, but not to zero psi! Maybe u have a faulty sensor, or u mount the sensor on the supply line (should be on the return side)?
using the Perth-WRX mobile app
__________________
MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport |
#3
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Faulty FPR more than likely - not holding pressure - drifting with temp changes.
What brand is it? Try another FPR - that's known to be working.
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[CENTER][SIGPIC][/SIGPIC][/CENTER] [CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER] |
#4
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doesn't hold pressure when fuel system is primed.
not sure about fuel pump duty cycle. i have 99-00 wrx, i don't think it has fuel pump controller, just relay? It's brand new 1200 turbosmart reg. I've got sard standard reg ill try tomorrow, it's smaller and perhaps better for my setup. |
#5
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Quote:
Are you sure you haven't mixed up the FPR inlet & outlet ports?
__________________
[CENTER][SIGPIC][/SIGPIC][/CENTER] [CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER] Last edited by Rossco; 07-11-2015 at 07:17 PM. |
#6
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Quote:
__________________
[CENTER][SIGPIC][/SIGPIC][/CENTER] [CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER] |
#7
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Connected correctly . 1200 turbosmart reg has two inlet ports and return line.
Anyways i've connected sard reg. but not mounted, primed fuel system and bang pressure holds. Ran engine through warn up cycle and base pressure stable. Happy days. i'll need to do test drive tomorrow. |
#8
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Quote:
Edit: good to c sard fpr fixed the problem. I had a tomei fpr, it wasn't holding perfectly stable at high boost but sard is. using the Perth-WRX mobile app
__________________
MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport Last edited by s20525xxx; 07-11-2015 at 08:25 PM. |
#9
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Quote:
__________________
[CENTER][SIGPIC][/SIGPIC][/CENTER] [CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER] |
#10
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This is because 95% of the Tomei's on the market are Chinese knock offs and hard to tell apart from the legit ones.
__________________
[CENTER][SIGPIC][/SIGPIC][/CENTER] [CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER] |
Tags |
drop, fuel, pressure |
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