Hello, I was wondering if anyone knew what the pressure is on the fuel lines and how I can relive the pressure so I can cut the line open and splice something into it. Also, What is the TPS's voltage at WOT?

Thanks,
Mike

 

hello, wrong forum.
https://www.scionlife.com/forums/viewforum.php?f=97

 

i think this is the right forum for this question. He isnt looking for adding power. It sounds like he is adding a guage.

to relieve pressure from the fuel lines you want to take out the fuel pump fuse(whereever that is) and run the engine until it dies.
About the TPS. i dont even know what that is

PS please dont blow yourself up

 

If you don't know what a TPS is (throttle position sensor) then maybe you shouldn't be dispensing advice about fuel lines.

Mike, you should be able to pull the fuse for the fuel pump then try to start the car. It might run for a second but it will die quickly. I assume you're doing something with nitrous. Are you sure you need to cut the fuel lines?

 

I havent really looked around under the hood yet but Im pretty sure theres a scrahder valve that would be there for testing fuel pressure at the rail somewhere underhood.

 

That's probably for the A/C system.

 

that is what i assumed as well, so i thought mike might get better advice in the "power hungry" forum. mike, check there.

 

Yea, im researching nitrous right now, but i just wanted to know how to empty the fuel pressure, thanks! now i know! but where is the fuel fuse? just in the fuse box?? lol...


and yea, i think when i get my system im just going to splice into the fuel line

 

"Peter, did you get that memo?"

 

LMAO the A/C wow you have really never worked on cars egh?

Ill just step out now before I get you kids confused. TPS is Throttle Position sensor and usually uses a 5v reference signal on Domestics but its not hard to find out what the reference signal voltage is with a digital multimeter.

 

Unfortunately, I have a feeling you'll be back. The A/C system comment was not for your amusement. The tC has low and high pressure service valves for the A/C which are both schrader valves. I've looked through the tC manual and never seen any mention of a fuel pressure test fitting. Seems like it would be a bad thing to have, since if you removed the cover and depressed the valve fuel would come out. I still feel that if you find a schrader valve under the hood of the tC, you're more likely to be looking at the A/C system than the fuel system.

 

Your TPS voltage should be very close to 5.0 volts at WOT.

 

LMAO at tekniq - "i have 7 bosses!"

 

is WOT only when you floor it? i want the nitrous to activate at around 5k rpms, i can do that right?

 

Several cars I have exp with do have them. LS1s and there little brothers and many other motors but trust me I know the differene between the A/C system scrhader valves and the fuel pressure test fitting or at least I would hope so I am EPA 609 Certified.

Yes you can spray at 5000 if you would like but pleast do ur research and take all safety precautions before you try like a FPSS and A window switch and depending on the shot maybe even an aftermarket fuel pump.

 

As said in the last post it comes down to how you wire it. If you do not know much about tapping in for gauges, I STRONGLY suggest you pay a professional to do it. Nitrous is one of the easiest ways to screw your motor up, but the potential is great. And why 5K rpms? You'd spray for 1000 rpms, seems somewhat useless.

I'd install a WOT switch and a momentary switch inside if you really want a selectable rpm/gear spray without breaking the wallet.

If you have an Apexi RSM-GP, or a few other electronics that do this, you can use it for a 12V trigger to activate once you reach a certain speed, and if your at WOT.

 

WOT=wide open throttle

 

I haven't looked to find the TPS in the tC, but I assume it would be on the throttle body. On my old car, it was on the side of my throttle body, facing the firewall.

 

and just remember one thing before some of the nitrous Noobs start hopin in here.

NITROUS will not hurt your motor if done correctly with a good fuel system behind it.

bad nitrous tunes and insuffiecent fuel systems and MONSTER shots hurt motors so make sure to do lots of research on it before you run it.

 

I havent worked on many FI cars that did NOT have a test fitting on the fuel rail