79 rx7 s5 t67 turbo fuel lines question
02-13-10, 06:09 AM
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79 rx7 s5 t67 turbo fuel lines question
Ok, I am ready to attempt a fuel system this week. I have a s5 motor with a t67 turbo and a bunch of other stuff. I guess what is important is that I have a bunch of fuel line, a whalbro 255 a great big fuel filter and a sard fpr. I accidentally broke the plastic nipple on the carbon thing...I am wondering how bad I need that. Will it be safe to do my fuel system with the parts I have listed? Can I just run the fuel from the pump to the rails, to the fpr, right back to the tank?
Thank you guys...
Thank you guys...
02-13-10, 10:43 AM
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What are you running as far as management and injector sizes?
I'd suggest sumping the fuel tank as the carbureted cars had very little baffling and the pump will end up sucking air.
The charcoal canister is to capture evaporated fuel vapours. You don't technically need it, but the car will stink of fuel if that line is left open. I'd recommend replacing the canister.
Yes, run the line from the pump to the rails (in parallel) to the FPR and back to the tank.
I'd suggest sumping the fuel tank as the carbureted cars had very little baffling and the pump will end up sucking air.
The charcoal canister is to capture evaporated fuel vapours. You don't technically need it, but the car will stink of fuel if that line is left open. I'd recommend replacing the canister.
Yes, run the line from the pump to the rails (in parallel) to the FPR and back to the tank.
02-13-10, 05:30 PM
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Thank you, right now I am running an hks pfkon box thing with a greddy fuel controller on top of that, but I am ordering a rtek 2 and a safc neo just as soon as I get the fuel run and know it runs again. I have 550, nd 1600 injectors.
I am not familiar with sumping on cars (same as on houses?) haha
Thank you!
I am not familiar with sumping on cars (same as on houses?) haha
Thank you!
What are you running as far as management and injector sizes?
I'd suggest sumping the fuel tank as the carbureted cars had very little baffling and the pump will end up sucking air.
The charcoal canister is to capture evaporated fuel vapours. You don't technically need it, but the car will stink of fuel if that line is left open. I'd recommend replacing the canister.
Yes, run the line from the pump to the rails (in parallel) to the FPR and back to the tank.
I'd suggest sumping the fuel tank as the carbureted cars had very little baffling and the pump will end up sucking air.
The charcoal canister is to capture evaporated fuel vapours. You don't technically need it, but the car will stink of fuel if that line is left open. I'd recommend replacing the canister.
Yes, run the line from the pump to the rails (in parallel) to the FPR and back to the tank.
02-14-10, 11:10 AM
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02-14-10, 04:49 PM
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Thank you guys, That sump looks doable 
I am just confused about the charcoal canister now. You see it and the line it was attached to broke off at some point between when I was pulling the engine from the 91 rx7 and dropping it into the 79. I'm not sure that I am understanding where that goes...It is not part of the fuel sytem, it is off the manifold or something?
I am just confused about the charcoal canister now. You see it and the line it was attached to broke off at some point between when I was pulling the engine from the 91 rx7 and dropping it into the 79. I'm not sure that I am understanding where that goes...It is not part of the fuel sytem, it is off the manifold or something?
02-15-10, 02:44 PM
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I am pretty worried about it, but frankly i cant afford much more...I guess if you saw what is running it now you would understand why I dont feel toooo bad! haha It is a hks pre programmed chip thing with a greddy fuel controller that only changes at 5 points. So hopefully the rtek with a safc neo on top will keep it all controlled within reason...I am just running 14 pounds of boost...what do you think??
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02-16-10, 09:53 AM
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S-AFCs are for messing with the stock turbo, RTeks are for mild upgrades. I'm not sure you are going to get the control you need. Then again, if you don't mind the car driving pig rich under boost and just "OK" under light load, it will probably do the job.
02-18-10, 05:14 AM
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Ok... so I ran the fuel lines today....I am hoping to run this by you guys to see if I have messed anything up. I ran fuel line from the tank to my new filter to my walbro 255 and from there up to the engine. At the engine there were 3 hard lines in a row. From the front of the car to the back I went return line, feed line, and the third closest to the firewall was capped...From the return line (the one closest to the front of the three) I ran the hose to the side of my sard fpr and then one down and out the bottom all the way back to my tank.
Now I cant start the car yet because I havnt got the right coolant pipes to get my aluminum radiator plumbed but I do have the fuel pump run to a switch.
When I turn the fuel pump on it is pumping something but my greddy fp gauge (electric from fpr) reads 0. After running the pump for a couple minutes I pulled the new fuel line off of the return from the fpr and it had not seen fuel....
Have I plumbed this all right? Will I be ready to fire the engine with this setup?
Thank you guys...
Now I cant start the car yet because I havnt got the right coolant pipes to get my aluminum radiator plumbed but I do have the fuel pump run to a switch.
When I turn the fuel pump on it is pumping something but my greddy fp gauge (electric from fpr) reads 0. After running the pump for a couple minutes I pulled the new fuel line off of the return from the fpr and it had not seen fuel....
Have I plumbed this all right? Will I be ready to fire the engine with this setup?
Thank you guys...
02-18-10, 09:32 AM
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The Walbro is mounted externally? Do they make an external pump? Remember that the filter at the inlet of the pump needs to be very low restriction. The filter at the outlet of the pump can have a finer element.
Your lines need to run like this: pump to filter to primary fuel rail (PD side) to secondary fuel rail (non-FRP side) from the secondary fuel rail (FPR side) back to the tank.
Your lines need to run like this: pump to filter to primary fuel rail (PD side) to secondary fuel rail (non-FRP side) from the secondary fuel rail (FPR side) back to the tank.
02-18-10, 11:18 PM
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Hmmm...I checked and Ive run it like that the only thing is that I just trusted that I was installing my gas feed in the right place...Can anyone with an s5 tell me where their fuel feed plugs in...There are three solid lines that come out right under the intake pipe/throttle body. When I pulled the motor from the donor car before putting it in my 79 i left the fpr on. It was on the solid fuel pipe closest to the front of the car. Behind that I have my feed and the one closest to the firewall is blocked off...
The issue is my oil now stinks like fuel and is over full after i tried to prime the fuel pump today. Still 0 fuel pressure...is there any chance that i pumped fuel into my oil by plugging it into the wrong line??
Help!
thanks
The issue is my oil now stinks like fuel and is over full after i tried to prime the fuel pump today. Still 0 fuel pressure...is there any chance that i pumped fuel into my oil by plugging it into the wrong line??
Help!
thanks
The Walbro is mounted externally? Do they make an external pump? Remember that the filter at the inlet of the pump needs to be very low restriction. The filter at the outlet of the pump can have a finer element.
Your lines need to run like this: pump to filter to primary fuel rail (PD side) to secondary fuel rail (non-FRP side) from the secondary fuel rail (FPR side) back to the tank.
Your lines need to run like this: pump to filter to primary fuel rail (PD side) to secondary fuel rail (non-FRP side) from the secondary fuel rail (FPR side) back to the tank.
02-20-10, 03:02 PM
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uh oh, are there any serious consequences to that? I change the oil right away to be safe...I guess il take my intercooler piping off and stop being lazy and do it right before I make anymore dumb mistakes! haha Thanks for your help
O and once I have the crank case line capped, what are the consequences of that? The car came with it stock, but I get an uneasy feeling about blocking some of that stuff...
O and once I have the crank case line capped, what are the consequences of that? The car came with it stock, but I get an uneasy feeling about blocking some of that stuff...
02-21-10, 10:19 AM
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No consequences if you just change the oil.
Don't cap the vent line. Set it up with a PCV valve. The lower line on the iron goes to a catch can, with an air line to the TID after the AFM. Then the upper line on the oil neck goes through a PCV valve to a vacuum nipple on the intake.
Don't cap the vent line. Set it up with a PCV valve. The lower line on the iron goes to a catch can, with an air line to the TID after the AFM. Then the upper line on the oil neck goes through a PCV valve to a vacuum nipple on the intake.
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