Dropping Fuel pressure
03-15-2005, 11:36 AM
#1
Moderator who thinks he is better than us with his I30
Thread Starter
iTrader: (8)
Join Date: May 2002
Posts: 9,335
Dropping Fuel pressure
Installed the walbro a few days ago and started the car, idle fuel pressure was at 40psi via my defi electronic, exactly where is should be with the walbro. But when the car is off and the key is at the on position the fuel pressure slowly drops from 40 to 10. Is this normal with the walbro?
03-15-2005, 11:56 AM
#2
Yes, when you first turn to ON, the pump primes, but after a few seconds it turns off the pump, if you don't start.
Not sure on how long it should normally take to drop from 40-10 though, but I'd say probably a few minutes?
Not sure on how long it should normally take to drop from 40-10 though, but I'd say probably a few minutes?
03-15-2005, 11:59 AM
#3
Moderator who thinks he is better than us with his I30
Thread Starter
iTrader: (8)
Join Date: May 2002
Posts: 9,335
This did not happen with my stock pump. I could turn the car off and leave the key in the "on" position and it would sit at 35psi for ever. Now it starts dropping right away. Maybe 1 minute or so to hit 10 psi.
If it used to do this on my stocker I would not be so concerned.
The one time I did start the car with the walbro in the fuel pressure did stay steady at idle, it just drops when the car is turned off.
If it used to do this on my stocker I would not be so concerned.
The one time I did start the car with the walbro in the fuel pressure did stay steady at idle, it just drops when the car is turned off.
03-15-2005, 12:13 PM
#5
Moderator who thinks he is better than us with his I30
Thread Starter
iTrader: (8)
Join Date: May 2002
Posts: 9,335
Originally Posted by seximagtr
mine is the exact same way - it starts and jumps to 40ish psi, and slowly lets off to about 10.
03-15-2005, 12:35 PM
#7
Senior Member
Join Date: Mar 2001
Posts: 470
Yeah. I have the same effect too. With the stock Fuel Pressure Regulator and pump it would sit at 32-35psi. Thats becuase the stock pump keeps the line pressurized in the off state.
The Walbro 255 High Flow Pump, does not keep the lines pressurized in the off state. It will only pressurize when the pump is turned on. I know there is a Walbro HF and HP pump. HF= High Flow and HP= High Pressure.
The Walbro 255 High Flow Pump, does not keep the lines pressurized in the off state. It will only pressurize when the pump is turned on. I know there is a Walbro HF and HP pump. HF= High Flow and HP= High Pressure.
03-15-2005, 07:36 PM
#13
Senior Member
Join Date: Mar 2001
Posts: 470
FYI.. When the key is turned to ACC, the Fuel Pump is running.
Originally Posted by matty
Mine doesnt do that...mine will actually rise if I sit there and say listen to the radio with it at ACC on the key..it will NEVER drop below 40
-matt
-matt
Thread
Thread Starter
Forum
Replies
Last Post
jmlee44
4th Generation Maxima (1995-1999)
8
10-02-2022 02:13 PM
My Coffee
New Member Introductions
15
06-06-2017 02:01 PM
Forge277
1st & 2nd Generation Maxima (1981-1984 and 1985-1988)
12
06-13-2016 09:26 PM
maxima-junky
4th Generation Classifieds (1995-1999)
1
10-07-2015 06:13 PM