fuel pressure question about my s13 red top - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Id RaThEr DrIfT · 07-15-2006, 09:10 PM

okay its at 42 psi right now well as of a week ago so they told me thats to rich! so i figure and so did a shop that a fpr might help out ... okay so i got my nismo fpr im gonna install it what do i set it at i have a fuel pressure gauge but also dont no were exacly to install it, can someone help were do i connect it and at what psi to set it?

all i have is a full 3" exh

also another reasone why im running a lil rich is because at the moment i dont have an o2 sensor connected to the (o2 housing/elbow) so yeah...

okay i installed my gauge on the same line/hose as the fpr is that okay?

smithers584 · 07-15-2006, 10:18 PM

are you sure your vacum line is hooked up on your stock fpr? it should be at 42psi if you dont have the line on and with it on i think its like 36 or 38 i cant remember, so that is what you are gonna want to set your new one at. install the gauge on the fuel supply line, thats the one coming from the filter obviously.

Id RaThEr DrIfT · 07-15-2006, 10:30 PM

well yeah i was told it was 42 w/o vac and i installed the gauge on the same line as the fpr is that okay?

smithers584 · 07-15-2006, 10:44 PM

is your gauge installed between the fuel rail and the regulator? if so then thats good but if you installed it after the regulator on the return line then you wont get accurate readings. all that really matters is that the gauge is installed before the regulator. most people install the gauge right after the fuel filter before it goes to the hardline on the rail.

Id RaThEr DrIfT · 07-15-2006, 10:49 PM

okay this is what it looks like ....... and also does anyone know why my gauge aint working it doesnt read nothing at all and its brand new also i blow in it and the needle doesnt move at all eithere there was a screw in the middle of course took it out so that it could get the pressure in but no it still doesnt do a bit so yeah any help??????

smithers584 · 07-15-2006, 10:58 PM

your gauge is on the return line, you need to move it to the supply line. look at your last pic, see the fuel line to the very right of the gauge, the one the gauge is almost touching? install your gauge there. if you gauge is not moving at all check to make sure that nothing is clogged up in the gauge itself.

Id RaThEr DrIfT · 07-15-2006, 11:02 PM

so the line that is on top of it basicly?? the one connected to the fuel filter?
and since i conected it to the wrong line obiously does that mean it shouldnt work? as in it wouldnt move at all like its doing at the moment?
and how do i check if it clogged up?

smithers584 · 07-15-2006, 11:10 PM

yes, look at your fuel filter and follow the supply line coming from the top of it that goes to the hardline between you first two intake runners. somewhere on the line would be a good place to install it.

with it installed the way you have it, you should see it move, readings would not be accurate though.

i would look inside the fitting you have on it to see if there was anything in there. you could try using a air compressor with low psi to see if it will move.

Id RaThEr DrIfT · 07-15-2006, 11:15 PM

OOOO okay damm it lol i have to go but some new hoses tomorrow ... but yeah ill try that and the copressor see what happends thanx bro!

Id RaThEr DrIfT · 07-17-2006, 01:57 AM

okay i switched it today to the other hose and it worked! =-) and good thing i didnt use the car all yesterday cause since i had installed my nismo fpr it was set at 50 psi ... yeah it work'd right away when i replaced it to the other fuel line and i dropped it to 36 psi is that okay???? or should i set it higher? also is it normal/okay for the fuel pressure to rise to 40 or soo when i rev it????

smithers584 · 07-17-2006, 07:22 AM

yes it will rise when you rev it. yeah 36 is the stock setting so you should be fine with that.

07-15-2006, 09:10 PM	#1
Id RaThEr DrIfT Zilvia Addict Join Date: May 2006 Location: socal Posts: 845 Trader Rating: (0) Feedback Score: 0 reviews	fuel pressure question about my s13 red top okay its at 42 psi right now well as of a week ago so they told me thats to rich! so i figure and so did a shop that a fpr might help out ... okay so i got my nismo fpr im gonna install it what do i set it at i have a fuel pressure gauge but also dont no were exacly to install it, can someone help were do i connect it and at what psi to set it? all i have is a full 3" exh also another reasone why im running a lil rich is because at the moment i dont have an o2 sensor connected to the (o2 housing/elbow) so yeah... okay i installed my gauge on the same line/hose as the fpr is that okay?

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07-15-2006, 10:18 PM	#2
smithers584 Zilvia Junkie Join Date: Dec 2004 Location: sc Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	are you sure your vacum line is hooked up on your stock fpr? it should be at 42psi if you dont have the line on and with it on i think its like 36 or 38 i cant remember, so that is what you are gonna want to set your new one at. install the gauge on the fuel supply line, thats the one coming from the filter obviously.

07-15-2006, 10:30 PM	#3
Id RaThEr DrIfT Zilvia Addict Join Date: May 2006 Location: socal Posts: 845 Trader Rating: (0) Feedback Score: 0 reviews	well yeah i was told it was 42 w/o vac and i installed the gauge on the same line as the fpr is that okay?

07-15-2006, 10:44 PM	#4
smithers584 Zilvia Junkie Join Date: Dec 2004 Location: sc Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	is your gauge installed between the fuel rail and the regulator? if so then thats good but if you installed it after the regulator on the return line then you wont get accurate readings. all that really matters is that the gauge is installed before the regulator. most people install the gauge right after the fuel filter before it goes to the hardline on the rail.

07-15-2006, 10:49 PM	#5
Id RaThEr DrIfT Zilvia Addict Join Date: May 2006 Location: socal Posts: 845 Trader Rating: (0) Feedback Score: 0 reviews	okay this is what it looks like ....... and also does anyone know why my gauge aint working it doesnt read nothing at all and its brand new also i blow in it and the needle doesnt move at all eithere there was a screw in the middle of course took it out so that it could get the pressure in but no it still doesnt do a bit so yeah any help??????

07-15-2006, 10:58 PM	#6
smithers584 Zilvia Junkie Join Date: Dec 2004 Location: sc Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	your gauge is on the return line, you need to move it to the supply line. look at your last pic, see the fuel line to the very right of the gauge, the one the gauge is almost touching? install your gauge there. if you gauge is not moving at all check to make sure that nothing is clogged up in the gauge itself.

07-15-2006, 11:02 PM	#7
Id RaThEr DrIfT Zilvia Addict Join Date: May 2006 Location: socal Posts: 845 Trader Rating: (0) Feedback Score: 0 reviews	so the line that is on top of it basicly?? the one connected to the fuel filter? and since i conected it to the wrong line obiously does that mean it shouldnt work? as in it wouldnt move at all like its doing at the moment? and how do i check if it clogged up?

07-15-2006, 11:10 PM	#8
smithers584 Zilvia Junkie Join Date: Dec 2004 Location: sc Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	yes, look at your fuel filter and follow the supply line coming from the top of it that goes to the hardline between you first two intake runners. somewhere on the line would be a good place to install it. with it installed the way you have it, you should see it move, readings would not be accurate though. i would look inside the fitting you have on it to see if there was anything in there. you could try using a air compressor with low psi to see if it will move.

07-15-2006, 11:15 PM	#9
Id RaThEr DrIfT Zilvia Addict Join Date: May 2006 Location: socal Posts: 845 Trader Rating: (0) Feedback Score: 0 reviews	OOOO okay damm it lol i have to go but some new hoses tomorrow ... but yeah ill try that and the copressor see what happends thanx bro!

07-17-2006, 01:57 AM	#10
Id RaThEr DrIfT Zilvia Addict Join Date: May 2006 Location: socal Posts: 845 Trader Rating: (0) Feedback Score: 0 reviews	okay i switched it today to the other hose and it worked! =-) and good thing i didnt use the car all yesterday cause since i had installed my nismo fpr it was set at 50 psi ... yeah it work'd right away when i replaced it to the other fuel line and i dropped it to 36 psi is that okay???? or should i set it higher? also is it normal/okay for the fuel pressure to rise to 40 or soo when i rev it????

07-17-2006, 07:22 AM	#11
smithers584 Zilvia Junkie Join Date: Dec 2004 Location: sc Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	yes it will rise when you rev it. yeah 36 is the stock setting so you should be fine with that.