just wondering if all the APS TT kit come with a fuel return system? If so, how good is it compared to the AAM or similar brands? Just wanted to know since I am getting it for my car.

 

Yes it does but from what I hear a aftermarket is better. Why would you buy a APS one? Bro you might as well had bought a APS kit. Your installer is taking all the parts from a APS kit.

 

The APS is not a true fuel return system like AAM or CJM.

 

No rails or fuel lines to the rails or return line from rails, it installs a FPR at the fuel tank area with the supply hose from the pump going to it and then a return line from there to the tank and the stock supply line to the rails.

They are working on what they call the "Extreme Fuel Sysytem"

 

Yes and no... It does not include a "traditional" fuel return system (i.e. pressure regulater at the end of the rails with a fuel line going back to the tank). It places the FPR in the tank and maintains a target pressure by running a LONG vacum signal to the gas tank... Thus, instead of routing excess fuel to the rails and then returning it back to the tank, the presure regulation is in the tank so there is no need to return it. While this is an improvement over the stock system, this is not the best way to set it up because it incorporates such a long vacum signal which can result in slight variations from the target fuel pressure. However, it is cost effective because you do not have to replace the fuel rails or run a fuel line back to the tank. For power levels above 450-500whp, upgrading to a true fuel return system would be advisable because a short vacum signal will give you better responsiveness in target fuel pressure and a more predictable fuel delivery... which is important for a good tune. For the stock APS boost, the system that is included should be fine.

 

better described as a before the fuel rails (injectors) return system.. the AAM and CJM setusp have the return occur after the fuel rails which should provide a stabler fuel delivery platform.. the aps is supposed to works for ~400 whp applications.. it keeps the differential fuel pressure in check.. i have it reading around 4.2 and 4.3bar in normal operation.. it dips for an instant a small amount to 4.1 when punching it and goes to 4.4 when backing off suddenly.. i'm curious to see what others have seen in differential FP with the CJM or AAM return at the rails fuel system..

 

Anyone have the insturction/manual for the AAM or CJM fuel return system? I'm thinking of buying one from a forum member but he no longer has the manual.

 

The APS TT fuel system is a compromise to reduce costs. For 500whp or less, I dont see any problems with it, but a complete fuel return system, such as the AAM system is the better approach.

If I had an APS TT kit, I wouldnt bother upgrading it. But if you are running a Greddy kit, or TN kit, for instance, then get the AAM system.

 

Roughly how many hours shop time (for a competent shop) to do a fuel return system install (incl. Walbro). Just so I can have a figure to 'wave' at UK installers

[Slightly OT but I think original question was answered]

 

$300, which is about 4 hours labor.

 

Thanks Sharif. That'll be about $400 here in UK

Get Christmas out the way and I'll be doing some ordering

 

what about a digital FMU ?
could this work the same way ?

 

No, I an FMU is another work around. It increases fuel pressure in the line under boost, but doesnt return fuel to the tank, nor does it maintain safe and steady differential pressure. It essentially overpressurizes the lines.