fuel regulator

Jul 27, 2011
4
1
503
Kuala Lumpur
bro im using works , set the pressure at 4 bar, but after a few spirited drives the pressure drops to 3 bar. Issit pump faulty or FPR faulty. Once I switched off the engine the psi doesn't drop suddenly, means tat the valve is ok right. Tried to change the pressure by turning the bolt on top but psi doent change. ANy ideas?
 

upontheriversky

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upontheriversky

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Dec 31, 2007
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i have a question, my fuel rail has no return line, if i upgrade the fuel pump for more fueling purposes with stock injectors, whats the point of fuel regulator when the fuel is being pumped to max pressure at the returnless rail?

any problem with fuel pressure being too high?
 
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Wilson13B

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Wilson13B

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Dec 15, 2010
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Just install a FPR from Tomei "Taiwan" .... at 1st the pressure rise to about 4.5Bar and it is adjustable.....but after driving for a while i feel the car lean out just like last time before the FPR has installed....after check found out the FPR reading drop from 4.5Bar to just 2Bar....try to turn the knob up but nothing happen and once turn off the engine the pressure straight drop to 0bar,just on the key last time the pressure will be 2 Bar and engine running is at 4.5Bar,now on the key,no pressure,engine running only get 2Bar ~

What happen,does the FPR kong dy.....would it be so fast =S
 

mines998

1,000 RPM

mines998

1,000 RPM
Dec 1, 2010
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Kuala Lumpur
Bro you set your pressure to 4.5bar during idling? In this case that way too high normaly fuel press should be at 2+bar during idling and it will go up while rpm go higher. If the fuel pressure only 2bar while engine running that is dangerous. Check the if there any leaking or if could be yr FR is defect.
 

Wilson13B

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Wilson13B

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Dec 15, 2010
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Kuala Lumpur
Bro you set your pressure to 4.5bar during idling? In this case that way too high normaly fuel press should be at 2+bar during idling and it will go up while rpm go higher. If the fuel pressure only 2bar while engine running that is dangerous. Check the if there any leaking or if could be yr FR is defect.
No lah....engine will stall lo if 4.5 bar at idle....i adjust it with vacuum hose unattached,if the vacuum hose is attached to it,it will drop to around 2 bar ~

Just now test the FPR with another external fuel pump....goes all the way til 5Bar and down to 2Bar without any problem....guess there is a problem in the fuel delivery line,i suspect the ori fuel regulator has leaking,need to sort that tomorow ~
 

karl_razlie

500 RPM
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karl_razlie

500 RPM
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Apr 25, 2005
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Puchong
dun buy replica FPR, use ori SARD or Works which got warranty.... for perodua car b4 u install this FPR first need to take out ur ori FR which inside ur tank... if not ur new FPR function is wasted d.... ori perodua 2.5bar at idle... if turbo hi-boost engine try set 3 or 3.5bar at idle.... btw make sure ur replica FPR valve or diafram inside is ok...other u will experience symptom like what u feel now..hehe
 

Wilson13B

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Wilson13B

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Dec 15, 2010
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Kuala Lumpur
Today take out and blocked the hole already.....but now new problem....the car run too rich,even i unscrew the adjusting nut the pressure still around 2.8-3bar which is too high for my car,now on free gear rev til 6K rpm the exhaust keep pop out fire and black smoke and on drive only got to 4K before pop out fire and black smoke....the engine can't rev beyond that revs.....i think is the fuel pump too big for the car already as it was from a 2JZ toyota Supra,anyway that i can decrease the pressure more?

Thanks =)
 

sideksepakragabulat

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sideksepakragabulat

Active Member
Jun 28, 2011
37
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Kuala Lumpur
hi there..spend almost an hour to read from 1st page to the end..

i've just install walbro 210lph to my car due to the old pump is dying out..previously using a 4G93t fuel pump and when i go for dyno setting the tuner told me that my pump is "lembek" olready..he crank up the pressure up to 5kg/cm2 and only manage to get around 12 AFR..after changing the pump shud i maintain the old pressure or shud i decrease the pressure back to 3kg/cm2?i've tried to lower the pressure back to 3kg but the car feel a lil bit "lembap" and i'm having a "pop"2 sound from my exzos when i'm shift gear in lower rpm (always happen when i'm shiftting below 3k rpm)..but when i turn up the pressure back to 5kg my car feel a bit more smooth and the "pop" sound from ekzos disappear a little bit..

i'm using L2s engine with 240cc injector..what shud i do now?maintain the current pressure (5kg/cm2=almost 70psi) or lower the pressure back to 3kg/cm2?and also i'm using safc2 which at idle speed is showing -20% correction and will increase as the rpm increase..

or am i killing the new pump with the high pressure setting?..FYI the reading is on idle speed..and is 240cc injector is sufficient enuf for me to hit around 140whp with AFR around 11?

hope someone can help me here..this issue has kept bothering me long enuf..