extremly high fuel pressure - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

90s13coupe · 09-20-2010, 11:10 AM

I have been trying to figure out what is up with my sr20 swap, the fuel pressure is around 80 psi at idel and i put a nismo adjustable fuel presure regulator on and when i adjusted it nothing changed, it just stays at 80psi. The car runs fine until u get into full boost and up around 4000-4500 rpms. Can anyone help me?

eklips3 · 09-20-2010, 09:26 PM

maybe too much voltage is going through to the fuel pump ?

codyace · 09-20-2010, 09:51 PM

Does your gauge work? or is the FPR known working?

Remember

Pump
Feed
Filter
Gauge
Rail In
Rail Out
FPR
Return

you should immediatly see a change when using an FPR and adjusting it.

90s13coupe · 09-28-2010, 08:58 PM

i need more help than that because i read that a walbro 255 fuel pump can only put out 75psi max at 13.5 volts and mine is putting out 80-90psi at 13.5 volts

VQMaxFan · 09-28-2010, 09:01 PM

is there even a change in pressure when you unhook and hook up the vac. source?

codyace · 09-29-2010, 10:03 AM

Quote:

Originally Posted by 90s13coupe

i need more help than that because i read that a walbro 255 fuel pump can only put out 75psi max at 13.5 volts and mine is putting out 80-90psi at 13.5 volts

Um, where do you get these 'max' fuel presusres per voltage? Our cars don't have voltage regulated pumps, but vacuum.

Do you have an FPR on it?

09-20-2010, 11:10 AM	#1
90s13coupe Leaky Injector Join Date: Dec 2009 Location: virginia Age: 31 Posts: 104 Trader Rating: (0) Feedback Score: 0 reviews	extremly high fuel pressure I have been trying to figure out what is up with my sr20 swap, the fuel pressure is around 80 psi at idel and i put a nismo adjustable fuel presure regulator on and when i adjusted it nothing changed, it just stays at 80psi. The car runs fine until u get into full boost and up around 4000-4500 rpms. Can anyone help me?

09-20-2010, 09:26 PM	#2
eklips3 Zilvia Addict Join Date: Apr 2008 Location: Calgary Canada Age: 31 Posts: 626 Trader Rating: (3) Feedback Score: 3 reviews	maybe too much voltage is going through to the fuel pump ? __________________ 1992 240sx (RB20. [email protected])

09-20-2010, 09:51 PM	#3
codyace Post Whore! Join Date: Dec 2004 Location: Poconos, PA Age: 36 Posts: 8,030 Trader Rating: (58) Feedback Score: 58 reviews	Does your gauge work? or is the FPR known working? Remember Pump Feed Filter Gauge Rail In Rail Out FPR Return you should immediatly see a change when using an FPR and adjusting it. __________________ *Want Air Conditioning in your SR20 Swapped car? Check out www.sr20acbrackets.com for more information! Quest Alternator Conversions for SR20!* Check my Group Buy! Tired of lousy internal gates? Go external wastegate with one of my manifolds, Check out my group buy

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09-28-2010, 08:58 PM	#4
90s13coupe Leaky Injector Join Date: Dec 2009 Location: virginia Age: 31 Posts: 104 Trader Rating: (0) Feedback Score: 0 reviews	i need more help than that because i read that a walbro 255 fuel pump can only put out 75psi max at 13.5 volts and mine is putting out 80-90psi at 13.5 volts

09-28-2010, 09:01 PM	#5
VQMaxFan Zilvia Junkie Join Date: May 2008 Location: Mobile AL Age: 32 Posts: 464 Trader Rating: (3) Feedback Score: 3 reviews	is there even a change in pressure when you unhook and hook up the vac. source?