Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Go Back   Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum > General > Tech Talk

Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


Reply
 
Thread Tools Display Modes
Old 02-11-2019, 01:41 PM   #1
alicbr
 
Join Date: May 2018
Location: Houston
Age: 32
Posts: 13
Trader Rating: (0)
alicbr is an unknown quantity at this point
Feedback Score: 0 reviews
fuel pressure dropping please help

Hey guys I'm having fuel pressure issues. New, isr fpr, aem 340lph fuel pump,300zx fuel filter, new 72ilb Jim Wolf top feed injectors.

Fuel pressure will be at 38 psi w vaccume but after 10 minites of driving it drops to 20psi. I checked voltage to the pump and I'm @ 13.4v no vac leaks, tested fuel pump, no fuel leaks anywhere
alicbr is offline   Reply With Quote
Sponsored Links
Old 02-11-2019, 07:06 PM   #2
burnsauto
Post Whore!
 
burnsauto's Avatar
 
Join Date: Dec 2006
Location: 717, PA
Age: 38
Posts: 3,322
Trader Rating: (6)
burnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfection
Feedback Score: 6 reviews
Send a message via AIM to burnsauto
make sure you have a good ground to the fuel pump. the pump could be struggling with good voltage and a bad ground, heating up after 10 minutes of driving, and then slowing down.
__________________
burnsauto is offline   Reply With Quote
Old 02-11-2019, 07:37 PM   #3
jr_ss
Post Whore!
 
Join Date: Dec 2005
Location: Pa
Posts: 6,410
Trader Rating: (35)
jr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond repute
Feedback Score: 35 reviews
Send a message via AIM to jr_ss
Upgrade your wiring from the factory 18-20gauge to something a little more substantial.

Also, get rid of the knock-off FPR and invest in a quality piece.
__________________
*My SR20VET* Does your VTC gear rattle in your S14/15 SR? PM me.
jr_ss is offline   Reply With Quote
Old 02-12-2019, 09:25 AM   #4
alicbr
 
Join Date: May 2018
Location: Houston
Age: 32
Posts: 13
Trader Rating: (0)
alicbr is an unknown quantity at this point
Feedback Score: 0 reviews
hey guys thanks for the help ill try that when i get home. i forgot to mention my fuel pump is hardwired and on a relay i thought it could be the relay so i swapped that as well
alicbr is offline   Reply With Quote
Old 02-13-2019, 08:12 AM   #5
jedi03
Nissanaholic!
 
Join Date: Jul 2008
Location: albuquerque
Posts: 1,836
Trader Rating: (8)
jedi03 is on a distinguished road
Feedback Score: 8 reviews
would injector being stuck open cause something like this?
jedi03 is offline   Reply With Quote
Old 02-13-2019, 02:12 PM   #6
jr_ss
Post Whore!
 
Join Date: Dec 2005
Location: Pa
Posts: 6,410
Trader Rating: (35)
jr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond repute
Feedback Score: 35 reviews
Send a message via AIM to jr_ss
Quote:
Originally Posted by jedi03 View Post
would injector being stuck open cause something like this?
It could, but then it would run rough, puke black smoke like a diesel and ultimately wash down that cylinders walls. His oil would smell strongly of fuel too.
__________________
*My SR20VET* Does your VTC gear rattle in your S14/15 SR? PM me.
jr_ss is offline   Reply With Quote
Old 02-13-2019, 06:12 PM   #7
alicbr
 
Join Date: May 2018
Location: Houston
Age: 32
Posts: 13
Trader Rating: (0)
alicbr is an unknown quantity at this point
Feedback Score: 0 reviews
Hey guys thanks for the advice no luck but swapped the fuel filter and a bunch of rust looking stuff came out pulled the injectors out and had the same. Might need to drop the tank and clean it out anyone in Houston that’s willing to help
alicbr is offline   Reply With Quote
Old 02-14-2019, 07:49 AM   #8
jedi03
Nissanaholic!
 
Join Date: Jul 2008
Location: albuquerque
Posts: 1,836
Trader Rating: (8)
jedi03 is on a distinguished road
Feedback Score: 8 reviews
just run the pump to get the fuel into a container and drop it, easy peasy!
jedi03 is offline   Reply With Quote
Old 02-14-2019, 09:14 AM   #9
brndck
Premium Member
 
brndck's Avatar
 
Join Date: Jun 2003
Location: torrance, ca
Age: 42
Posts: 12,684
Trader Rating: (130)
brndck is close to perfectionbrndck is close to perfectionbrndck is close to perfectionbrndck is close to perfectionbrndck is close to perfectionbrndck is close to perfectionbrndck is close to perfectionbrndck is close to perfectionbrndck is close to perfectionbrndck is close to perfectionbrndck is close to perfection
Feedback Score: 130 reviews
Send a message via AIM to brndck
Quote:
Originally Posted by jedi03 View Post
just run the pump to get the fuel into a container and drop it, easy peasy!
that wont get all the gunk and grime out of the bottom of the tank. I've seen fuel socks that were so clogged up they would barely flow, causing the pump to overheat. remove the sock and drop the tank into a bucket with clean fuel and it would flow just fine!

also, I agree that a injector sticking open or a injector o-ring that is leaking, could also cause a fuel pressure drop, but it would def be running rich as fuck
__________________

http://outslidersandsmokeproduce.blogspot.com/
Quote:
Originally Posted by Mannykiller View Post
it'll fit JANK.. and no one likes Jank except Broke ass zilvians.
brndck is offline   Reply With Quote
Old 02-15-2019, 07:55 AM   #10
jedi03
Nissanaholic!
 
Join Date: Jul 2008
Location: albuquerque
Posts: 1,836
Trader Rating: (8)
jedi03 is on a distinguished road
Feedback Score: 8 reviews
negative...just do that to get fuel out then the tank doesn't have fuel and weighs next to nothing...last 3 fuel pumps i have done on SUVs the tanks were full and its a lot heavier lol! then you don't waste the fuel, can use it for cleaning or whatever and with the tank out you can wash it...don't use water tho!!!!!
jedi03 is offline   Reply With Quote
Old 02-19-2019, 02:58 PM   #11
TheRealSy90
Post Whore!
 
TheRealSy90's Avatar
 
Join Date: Mar 2009
Location: Maricopa, AZ
Age: 33
Posts: 7,721
Trader Rating: (10)
TheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant future
Feedback Score: 10 reviews
Anyone have a good suggestion for something to use to clean out a fuel tank? My spare is all full of dirt and crap I tried to get it acid dipped locally at a radiator shop, but the EPA put a stop to them having the acid dip tanks that they used to use.
__________________
Quote:
Originally Posted by crimsonrockett View Post
Such a good signature.
TheRealSy90 is offline   Reply With Quote
Old 02-26-2019, 08:35 AM   #12
jedi03
Nissanaholic!
 
Join Date: Jul 2008
Location: albuquerque
Posts: 1,836
Trader Rating: (8)
jedi03 is on a distinguished road
Feedback Score: 8 reviews
i have had good luck with lacquer thinner and washer bin solvent...just takes about forever...i would spray out as much as i could with water then go to town with the others before more surface rust starts
jedi03 is offline   Reply With Quote
Old 02-28-2019, 08:00 PM   #13
smoked240
Zilvia FREAK!
 
Join Date: Jun 2010
Location: North Dakota
Age: 33
Posts: 1,067
Trader Rating: (4)
smoked240 is not welcome here anymoresmoked240 is not welcome here anymoresmoked240 is not welcome here anymoresmoked240 is not welcome here anymoresmoked240 is not welcome here anymoresmoked240 is not welcome here anymoresmoked240 is not welcome here anymoresmoked240 is not welcome here anymoresmoked240 is not welcome here anymore
Feedback Score: 4 reviews
Send a message via MSN to smoked240
Quote:
Originally Posted by TheRealSy90 View Post
Anyone have a good suggestion for something to use to clean out a fuel tank? My spare is all full of dirt and crap I tried to get it acid dipped locally at a radiator shop, but the EPA put a stop to them having the acid dip tanks that they used to use.
Acetone should do the trick.
__________________
smoked240 is offline   Reply With Quote
Old 03-02-2019, 05:25 AM   #14
burnsauto
Post Whore!
 
burnsauto's Avatar
 
Join Date: Dec 2006
Location: 717, PA
Age: 38
Posts: 3,322
Trader Rating: (6)
burnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfectionburnsauto is close to perfection
Feedback Score: 6 reviews
Send a message via AIM to burnsauto
I've always been curious about eastwoods fuel tank cleaner kit. be the test dummy.

https://www.eastwood.com/gas-tank-se...nk-sealer.html#
__________________
burnsauto is offline   Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 06:18 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
vB.Sponsors
Copyright ? 1998 - 2022, Zilvia.net