Fuel pressure

[mcammarn]

I seem it somewhere, but can't find it now, but I know fuel pressure should be 36-40 with the lines connected.
But is that for stock fuel system?
I have 320 aem fuel pump and 560 cc inj. With lex mod to. Not sure where to put the pressure at

 

[T3rril79]

Here you go
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=73

 

[Dirgle]

Fuel pressure should be 23-30psi at idle with the vacuum line connected, 33-40psi when disconnected. That is for stock. It is also a good starting point for the Lex/550 mod. Adjustments to that pressure should only be made by your tuner in conjunction with a wideband. Any adjustments are only made to tune global fuel metering so the TCCS isn't stuck trying to compensate for minor calibration variances in the AFM and injectors(such as the slight difference between 550 and 560cc's).

 

[Dan_Gyoba]

With the Lexus/550 mod, I ran my FP at 38 PSI with vacuum disconnected. Setting at idle is somewhat dependant on other variables, so I didn't, I did verify that connecting vacuum to the FPR dropped fuel pressure at idle.

 

[mcammarn]

So the pressure shouldn't be over 40 then on any system? I think I'm just gonna run 40 and see where my wideband reads.

 

[Dan_Gyoba]

40 should be safe. I went with 38 because I figured that the middle of the stock range was a good place to start, and then I figured that a little high was probably better than a little low.

 

[jetjock]

The TSRM specifies a range of 33-40 because a stock 7MGTE uses Toyota's Type A fuel system, the spec for which is 36 psi. Simple as that.