Im installing a walbro 255lpm fuel pump. I will also be running a return line for my 2jzgte vvti swap. Here are my questions:
1. Can I use the stock fuel pressure line? Its seems like the stock line will bolt right up to my aristo engine. Im not sure if the stock line will hold back my fuel delivery since it seems a little small. Can someone tell me if its adequate? I plan on running just the return line and thats it.

2. Does the stock aristo engine have the fuel pressure regulator? Where the fuel line from the car attaches to the engine, there seems to be a regulator, but IM not sure if it is or not. I just want to confirm with someone instead of assuming.

 

Yes, you can use the stock line and only run a return line. It is fine up to around 400-500 crank hp.

Yes, the stock motor has a fuel pressure regulator, it's the little domed looking thing on the end of the rail with the vacuum line attached.

 

Awesome!!! Thank you so much for the quick reply macd7919.

 

Does the 2JZ-GTE VVTi have a return line? I thought that was only the non-VVTi motors.

On these cars the dome thing is the fuel pump pulse dampener. On the 2G GS300 the fuel system is a dead head with no return. Fuel pressure regulator is in the tank on the fuel pump assembly. It regulates fuel pressure at approx 42PSIg with no provision for rising rate pressure compensation.

 

Vvti Gte has a return line and also a Fpr mounted to the factory rail. I was referring to the FPR as the dome part on the opposite end of the rail from the dampener, I should have clarified that.

 

Jeff,
What does the pulse dampener do? what's its purose? the GS430 has this also.

 

It keeps the fuel delivery more consistent. The fuel pump does not deliver a steady stream, it's actually tens or hundreds of pulses per second. The pulsing may show symptoms such as slightly irregular idle. So the dampener is there in place to absorb the pulses so you don't notice it.

 

How did you come up with that number? Im just curious how you figure 400-500hp. So if I were to end up putting down say...440whp, then my stock line should still be adequate, right? Thanks

 

Rule of thumb on 2jz motors is about 1 crank hp per cc of injector. I'm not sure if you plan on running the stock jdm injectors (440cc) or swapping over to usdm (550 cc) with the repective resistor pack.

If you are running the Jdm 440's you will be limited to around 350whp, upgrading to the usdm injectors will get you safely to around 450whp. The oem (usdm and jdm) are both side feed so you can run them a little bit harder than a standard top feed injector.

Also, the number I mentioned previously was a peak crankshaft hp, not wheel hp, and on stock jdm injectors. Sorry if I didn't clarify.

 

where do you guys runs the fuel return to. do you guys just dump it in the tank or..?

 

tap into the top of the fuel tank where the fuel lines go out. Its underneath the drivers side rear seat.

 

So just throw it inside the tank from the top of the fuel sender unit. Do I have to route it to anything. Do I keep the in tank fpr and keep the fpr on the fuel rail. Or do I disable one? Sorry i was kinda lost

 

you do have to modify the intank unit. I'd PM jefftsai or hopefully he'll chime in. The way mine was done by a shop I'm not sure if it was correct or not cause I would run out of gas at 1/4 tank. I've put my tank assembly back to stock with the exception of the walbro intank pump for now and taking it up to jefftsai to do the fuel return correctly.

 

Let me know how it's done.