Fuel system upgrade time - quick questions!

[SiH]

Hi guys,
I need an FRP for my fuel system upgrade. I\'m looking at Aeromotive, and I think th eone i need is a variant of the A1000, but I\'m a bit confused as Aeromotive list \'Fuel PRessure Regulators\' and \'Bypass Regulators\' - is this just another name for the same thing, a la BOV/Dump valve sort of thing?

If so, I\'m trying to figure out what i need.
There\'s the A1000 (P/N 13101): http://www.aeromotiveinc.com/products.php?prod=11

or the A1000-6 (P/N 13109)
http://www.aeromotiveinc.com/products.php?prod=10

It needs to connect to this:


Which i got SH from Atomic Rex for a bargain price (Cheers guys)

Am i correct in thinking i just need P/N 13101?
I\'ll also need to connect what I have shown above to the stock fuel system - what else do i need? I\'m trying to get a full shopping list of everything I need so I don\'t need to order lots of tiddly little bits afterwards!
Sorry for all the n00b questions - suspension, I can do - fuel systems are a very new thing.
Any help hugely appreciated
Si

[AtomicRex]

Glad you like the fuel rail :Thumbsup!
 
The fuel rails are running -6 (dash 6) lines, so you need to make sure that the FPR has 2 connectors that are both -6 and a vacuum hose connector to give the boost control.
 
I think the 13109 is the item you will need.

[SiH]

That was what I thought, cheers Vacuum is no worries.
I\'m looking into the -6 version right now.

I\'ve got my head around how it all connects up (I\'ve done fuel stuff before, just not on the FD\'s setup) I\'m just trying to figure out what adaptors i need

I\'m guessing I need a -6 female to female adaptor to hook it up to the FPR, and I then run flexible line (Injection hose, of course) back to the stock lines (I\'m not ripping the whole lot out and going braided yet )

[AtomicRex]

There really is no point in going braided throughout....you cant run the 200 series in the car as it is porous so need to run the more expensive 800 series.

Run the outlet from the pump into the FRP -6 line to the fuel rail, the output to the fuel rail into the primary rail, and the output of that to the return line.  We didn\'t use JIC fittings on the primary rail, hence the fittings.  From memory I don\'t think it is very successful to try and fit JIC fittings to the Primary rail

[SiH]

There really is no point in going braided throughout....you cant run the 200 series in the car as it is porous so need to run the more expensive 800 series.

Run the outlet from the pump into the FRP -6 line to the fuel rail, the output to the fuel rail into the primary rail, and the output of that to the return line.  We didn\'t use JIC fittings on the primary rail, hence the fittings.  From memory I don\'t think it is very successful to try and fit JIC fittings to the Primary rail

Perfect - basically what I was planning but elucidated much more successfully :Giggle

Except for the rating of the lines - Nooo idea about them, just as well I\'m not doing that then!
Ta muchly

[DRAGON]

Run the outlet from the pump into the FRP -6 line to the fuel rail, the output to the fuel rail into the primary rail, and the output of that to the return line.  We didn\'t use JIC fittings on the primary rail, hence the fittings.  From memory I don\'t think it is very successful to try and fit JIC fittings to the Primary rail

The outlet of the pump does not go to the FPR, the RX7 and nearly every car as the FPR after the injectors. I dont think its a good idea to advise people if you dont know what your talking about.
2. The Primarys can take AN fittings, the location of the OMP injectors being an issue, its tight!
I dont really see the point in the push on line of the secondary rail, then going to a AN fitting, i\'d dump that and do it all in new rubber fuel hose, or do it all AN fittings, but that is a lot more work and expense.

[AtomicRex]

Ross
 
Ok well seeing as this is a forum based around discussion I will put my point across so as to explain my reasonings:
 
When making up a fuel rail you do need to consider some sort of take-off for checking the baseline pressure, hence an FPR. This is something we both agree about.
 
The job of the FPR is to keep the pressure constant, so that each injector pulse delivers the same amount of fuel. Small changes in base fuel line pressure will give substantial changes in the fuel delivery from a given injector. Seeing as though the fuel pump can often surge and deliver a lot more fuel pressure than the system requires surely it is better to have the FPR before the rail, with the excess pressure returning to the tank.
 
I do agree with you that most diagrams on the internet put the FPR after the rail, but whats the point in venting extra pressure after the rail, surely it is better to vent it out before?

[FD3UK]

I do agree with you that most diagrams on the internet put the FPR after the rail, but whats the point in venting extra pressure after the rail, surely it is better to vent it out before?

My take on this is that the the FPR is the resistance in the fuel line to create a variable boost/vacuum pressure in the fuel line from the pump to the injectors. Unused fuel is then returned to the tank.

Placing the FPR before the injector rails will result in controlled pressure from the pump to the FPR, leaving uncontrolled low pressure at the injectors.

[Timmy]

Surely if you put the fpr before the injectors your only controlling fuel line pressure and not the pressure the injectors recieve.

[AtomicRex]

Yes if you allow the line to vent back to the tank....but what about if you capped the end of the line? Then you are allowing the rail to be at a constant pressure, and it is full regulated. Stick a schrader valve in the system if you want to depressurise the system at anytime
 
Also with heat soak if you put the PFR in the away from the engine bay, you are keeping the fuel that returns to the tank a lot cooler.
 
If you were to avoid this idea I will concede that you would have to put the PFR after the rail otherwise you would be running the rail on atmospheric pressure as it would be venting directly to the tank.
 
Good way to waste an afternoon looking at fuel systems though

[shaunwil]

Out of interest what is the stock base pressure ?

I\'m going to be doing an install in the next month, hopefully :Giggle Using rails I designed

Shaun

[AtomicRex]

Depends on the flow rate of your injectors.  Ours are running at 42psi

[RobMatthews]

My take on this is that the the FPR is the resistance in the fuel line to create a variable boost/vacuum pressure in the fuel line from the pump to the injectors. Unused fuel is then returned to the tank.

Placing the FPR before the injector rails will result in controlled pressure from the pump to the FPR, leaving uncontrolled low pressure at the injectors.

Thats what i have always thought,never heard of a pump spiking?but then if it did then the fpr would regulate it that is whats its for.

[DRAGON]

So you think its OK to advise someone to do something that your limited experience/reasoning suggests is the correct way, rather than the way that has been used for numerous years and been proven reliable and safe?

[AtomicRex]

Well Actually the idea came from ATL who build fuel systems for the F1 teams....but you know what, I\'ll phone Williams and tell them to chat to you.