spoolin93r1

Okay, I just got done re-installing my new motor and i was stupid and forgot to label which fuel lines go to which hard pipes on the motor. i looked at the manual and it didn't really explain which one is what. i need to know which one is the return line, the feed line, and which one goes to the charcoal canister. i think the front is the feed the middle is the charcoal canister and the rear is the return, right?? correct me if i'm wrong

Rated R1

I think the vacuum line diagram shows it. Search around for it.

DK

iTrader: (5)

Your lines should have enough "form" to them that you should've been able to infer, but that's OK.

Front (left) is the feed line.
Middle is the return line.
Rear (right) is the charcoal canister vacuum line.

alwan16

as i remember two of the lines/pipes had dots on them...one white and one red...and the other one didn't. you might be able to reference it by that too.

cover8

are you sure? guess I have it wrong then...hmmm maybe that is why my car is not starting! I thought the middle (higher line) was the charcoal line?

please lets settle this!

thanks

DK

iTrader: (5)

Double post mania ... this forum seems to have lost its damn mind.

DK

iTrader: (5)

I'm almost pretty sure ... I've pulled them and put them on a dozen times ... but I also can't see straight right now because I have a killer headache so I could also not be thinking clearly! (This also happens just by chance.) My car also isn't with me for me to go check. It almost wouldn't make design sense to me to sandwich a vacuum line in the middle of a two fuel lines ... and I replaced my charcoal line with silicon and I always remember connecting it far right. But you know what? Let me find a vac diagram to make sure for you kids! I'd hate to tell you to return a pile of fuel into your charcoal canister!

cover8

still not clear by the drawing! I know the far left (closest to bumper) is the feed line to the rail, but the three form a triangle. There are two lines that are the same heigth and the one is higher than the other two. I thought the highest one (the one in middle) was the catch line not the return line...damn I seem to just get more and more confused

DK

iTrader: (5)

Yeah I'm sorta recalling what you mean by a triangle-esque setup ... the two that are on the same level horizontally should be the wet lines. I just remember always taking off the charcoal line first and attaching it last because it was the easiest to get out of the way. I kinda feel like a dumbass really having to wing this not having seen my bay in 6 months.

Take your elbow off and see if you can get a better look at them. The metal part of the charcoal canister line isn't very long and should be obviously connected to the catch tank. Use some fingering in there if you have to. Since you say one is above the others, that would be my instinct as being the one that doesn't belong (i.e. -- the vacuum line). I've probably also bent my line so that it appears on the far right side. I could answer this right away if I had a car or picture to look at right now, but mine is on the other side of the state.

maxcooper

The higher, middle line is the charcoal cannister line. The lower left is the feed and the lower right is the return. I just hooked up my FPR the other day, and the memory is clear in my head.

-Max

spoolin93r1

i really appreciate all the info guys, good to know i got people like you to back me up! hopefully i can get the lines connected and my fpr hooked up and get the beast running tomorrow evening.

maxcooper- what fpr are u using? where did u mount it? and did you tee the return lines? sorry about the questions, just making sure i don't kill this motor

maxcooper

I used an Aeromotive FPR, and used the bracket it came with an a few screws to mount it to the shock tower. I used a pair of 5/16 to AN6 90 degree fittings to connect up the stock-sized fuel injection hose (5/16") to the male-to-male AN6 fittings in the FPR. They are a bit pricey at $17 each, but they are totally perfect for this application. SS hose and fittings are expensive, heavy, and I think somewhat overkill for this stuff. I also have my SPA pressure sender plumbed to the 1/8 NPT gauge fitting with some brass fittings and 1/4" fuel injection line.

I just have the FPR installed in the return line. It goes in one side and out the bottom. The other side port is plugged, but I'd like to get a better plug for it, as I only had an AN6 flare plug, which doesn't cover the whole o-ring. No leaks yet, but it makes me nervous. The other AN fittings have a larger hex section and put the smack down on the whole o-ring.

For the manifold reference signal, I just ran a small vacuum hose up the the front of the UIM and teed into one of the lines there before a check valve. The gauge readings follow the boost pressure 1:1, so it looks like it worked.

I still have the stock FPR installed, but with the Aeromotive FPR set a little higher, it controls the pressure. My fuel pressure gauge reads correctly (well, it was reading correctly until I re-zero'd the gauge at idle, D'oh!). I want to replace the stock FPR with a NPT-to-5/16" hose barb fitting, but it works better than I expected with my current setup, so it isn't a super high priority for me. And it would be easier to switch back to SMOG-legal mode if I need to if I leave the stock FPR in place.

-Max

spoolin93r1

oh, so you put the fpr on the return line?? i was thinking you put it inline on the feed line and tee the return line with the stock hard line. i'm not too good with fuel systems. i have the rx7store secondary fuel rail if that helps. i also bought the -6an 90 degree fittings, for simplicity sake

maxcooper

Yes, the fuel has to flow through the rails before it hits the regulator. The regulator then bleeds just enough fuel into the return line (low pressure) to maintain the right pressure in the rails.

-Max

Rx7oneluv

sorry to bring this old thread back but....

I understand the middle/upper line is charcoal hook up. But my question is: If you go under the car you will notice one of the fuel lines is smaller than the other. Would this be the pressure line or the return line?

I would assume the smaller line is the pressure line, but I need to make sure. Please help the car is going back together....and this is just a little bit important. Thanks