matty

iTrader: (54)

OK after waiting nearly a week and half for the rebuild kit from Cartech, some of the parts were damaged, I put it all back together just now.

I put 10psi of pressure on the system and the fuel pressure went to 50....screwed down on the center screw and the fuel pressure didnt Budge...I didnt want to screw it in all the much because i dont wanna ruin the brand new metal spacer i just put in...I turned the car off and turned it to acc adn the fuel pressure read 60 still under 10psi of boost on the cartech.

How much do I need to screw that center down to get a 85psi of fuel pressure ?? I feel like a retard doing something wrong but Im not...

-matt

pawnstar12

where is your fp gauge hooked up in the fuel system?

Stephen Max

iTrader: (59)

Sorry if you have stated this before, but what fuel pump do you have? The reason I ask is that the stock fuel pump can only generate 60 psi, no matter what.

If your setup has the auxiliary inline fuel pump, then that has to be activated as well in order to get more than 60 psi.

matty

iTrader: (54)

I have an intake Walbro from PimpJuice
The Fuel pressure guage is hooked up behind the Cartech at the AEM FRP

Im fr*gin clueless on what could be the problem
I just dont wanna go too far in with the center screw cause I dont wanna bend that shim all that much...I done know anymore..I really just wanna drive this thing already

-matt

pawnstar12

fp gauge needs to be between fpr and the cartech to get correct readings

matty

iTrader: (54)

Well its on one of the ports of FPR...

I just went out side with the Cartech set screw down alittle bit and started the car and the Fuel pressure went, and staid at 50 when i started the car..

I had it running and I screwed the set screw, In The Center all the way OUT and the fuel pressure went back to 34 BUT THIS IS WITHOUT ANY MIGHTY VAC PSI ON THE CARTECH..!!!
Why is fuel pressure rising without and boost pressure on the UNIT ?? I AM LOST

My only guess is the sender Unit for the Fuel pressure Gauge ?? If I unlplug the sender for the fuel pressure gauge, the gauge goes all the way up to 100 really slow likes its cycling...so that part has to be working..I AM LOST

matt

matty

iTrader: (54)

Anyone..I really need help here...this is confusing the cr*p out of me..I dont know what else it could be but the fuel pressure sender...i DOnt know

I kinda think its the sender on for the Fuel pressure Gauge because when I unplug the line going from the sender to the black box inside the car, the fuel gauge slowely creeps to 100 and past 100...but as soon as i plug it back in it goes back to idle..

its weird, im at 34psi at idle and if i screw in the cartech at all the fuel pressure goes up, but shouldnt at all...its all in properly and I did it all correctly

-matt

matty

iTrader: (54)

????? 10 characters

-matt

matty

iTrader: (54)

I dont know..I just went out and had the car running and checked the "static pressure" of the pump...The pump is a brand NEW Walbro from PimpJuice...well I crimped the return line for the tank and all the pressure would ONLY go up to 48-50....
If I uplug the line going to the gauge from the sender the gauge goes up to 100 really slowly like the guage is woprking but maybe the sender is messed up...Anyone know or have any feedback
Could the brand NEW wablro be bad ??

I still dont know what would cause the fuel pressure to rise when the cartech is screwed in, without ANY boost put onto it at all...i need help

-matt

turbomax97

iTrader: (6)

if you crimped the line and u only got that much fuel press. then you're walbro is definately bad..... check voltage etc. on the pump

matty

iTrader: (54)

I dont see how the Wablro could be bad...its a BRAND NEW Unit from PimpJuice

-matt

pawnstar12

it happened to me

turbomax97

iTrader: (6)

doesn't matter - it's defective - i'm tellin ya its your pump... unless you have fuel leaking in the engine bay, then you're pump is shot.

matty

iTrader: (54)

Ive been pondering this about all day...and its pi**ing me off ...it cant be the Sender for the fuel pressure gauge ??

-matt

Stephen Max

iTrader: (59)

It could be. Get a mechanical fuel pressure gauge that you can screw into where you have the sender now. They are pretty cheap. That will help you determine if it is the pump or the sender that is the problem.

matty

iTrader: (54)

How come when the center screw is screwed in, My base fuel pressure is up at like 50 without the vaccum line on the cartech ??

Let me get this straight so I know im doing this right ....

Vaccum line off the cartech but keep it on the AEM FPR. Mightyvac on the cartech pumped to 10 psi and screw in the top screw on the cartech till I reach 85psi on my fuel pressure gauge. when i did my static pressure test I didnt have vaccum on the cartech so that might have messed it up. I Kinda wanna believe the sender is bad becuase the cartech is a brand new rebuilt Unit now...and the Walbro is Brand NEW

-matt

Shadow

iTrader: (15)

If you pull the sender, the gauge will read 100 psi since there is no signal going to it. Mine does the exact same thing, that is perfectly normal. The other problems you are having I can't help you with though.

matty

iTrader: (54)

I think its all fixed but for some reason, either where my fuel pressure sender is located (on the AEM FPR) or some other reason) I DONT see an increase of fuel pressure when I put 10psi of Fake boost onto the cartech with a mightyvac.?? for some reason the needle does NOT move...and when I do a static test on the fuel pump by crimping the return line, the fuel pressure only goes to 50-60 witch is odd.(possibly not crimping it for long enough)
But the thing is, when I boost, the fuel pressure will rise to a safe point 80-85

-matt

IceY2K1

iTrader: (3)

"But the thing is, when I boost, the fuel pressure will rise to a safe point 80-85."

That makes me think the fuel pump doesn't have enough voltage at idle while you're testing to provide >60psi, but during boosting, it does.

Buy a $35 Equis fuel pressure tester from Autozone. Hook it up between the incoming fuel line and the fuel rail. Then stick it between the hood and tape it to the windshield and go for a test drive. Slowly build boost and see if you peak at your desired psig.

matty

iTrader: (54)

would not enough voltage at idle have to do with a defective pump ??

-matt

IceY2K1

iTrader: (3)

No, wiring.

Check the voltage at the battery during idle ~13V. I'm not sure how, but try checking the voltage at the fuel pump terminals/wires while reving up the engine to see if it's still ~13V.

Just stabbing in the dark here though.

matty

iTrader: (54)

Could I have possibly missed a plug in the installation of the pump ?? im stabbing in the dark too here

-matt

IceY2K1

iTrader: (3)

Okay, I'm not sure how the Cartech works before the AEM FPR, but this is what I know from my POS Sentra.

If you leave the vacuum line applied to the stock FPR with the car idling, I get ~34psi. If I disconnect the vaccum line to the FPR, it pretty much immediately jumps to 43psi. If I pinch the fuel return line to the tank, I get 60ish psi, which is the max capacity of the stock fuel pump at idle. When I drive, I see ~34-40ish psi, when I go WOT, I see ~40-43psi and it bounces around a bit(could be a problem).

IMO, everything is working fine on your car, except when you say you had 50ish psi at idle once you messed with the Cartech set screw. I believe the Cartech can adjust static fuel pressure, dynamic/WOT fuel pressure during boost, and also where the Cartech kicks in.

Are you sure you're not playing with the wrong set screw?

matty

iTrader: (54)

Well I called Cartech and they told me to diconnect the vaccum line and screw in the top screw till I get 45 psi on the fuel gauge, cause thats what I will be gettin when I pass threw 0 on the boost gauge....I did that and thats it...the bleeder is all the way for the time being till i get tuned...

-matt