I just put my 92 305 TBI into my 87 Iroc that came from the factory with a LG4 cabed engine. The hard fuel lines on the 87 exit on the passenger side of the engine bay and my connection to the hard fuel lines on the TBI are over on the driver side.

Can I run rubber line all the way from the pass. side to the driver side of the engine compartment? Where is the best place to run it? I was thinking I could go down and around the front part of the radiator where the A/C condensor would have sat and then up to the TBI hard line.

 

Well you can always bend your tbi lines more toward the other side. You can run good quality rubber lines across the manifold if you are careful.

 

There is no way to bend the hard lines coming off the throttle body over to where the hard lines come from the frame.

Although I realize going over the manifold is the shortest route, I don't know how safe that is. I picked going in front of the radiator where the A/C condenser would sit becasue it should be out of the way of the heat from the motor.

So does anybody know how far I can safely run rubber line given the pressure of the TBI fuel system?

 

Seperate the tbi lines and flip them upside down, so they exit to the other side.

Good rubber hose can hold 50+psi, something you'll never see on tbi. You can run as much as you want as long as you don't kink it.

 

When you flip the hard lines over the ends that come to the base of the injector pod are pointed down. There is not much if any space to bend the lines up the other way although I would try this first before running rubber line. If it fails, run the rubber line shortest path, just make certain the line doesn't touch anything. I don't know how big of a rubber line you would be using but if it isn't too big try some wire conduit as a shield.
TBI = low pressure BUT tracks don't like to see lots of rubber line. If you've got a stock air cleaner or open element I'm sure they would assume it's a carb, if not, explain to them that TBI is a very low fuel pressure EFI. You've got lots of options but first try and bend the stock lines.

 

you can always get lengths of steel 3/8" line in any auto store, and bend them to route for most of the length you need. then run short rubber lines to join as necessary. You could go one step further and buy unions for standard 45 degree flare, and cut off the ends of the TBI lines and flare, so that the whole fuel line is steel. This is fine as long as you get the flares made correctly. standard 45 double flare fittings can handle mucho pressure if done correctly. In any case, I would keep the rubber to less than 4 inches anywhere. Junkyards are also good places to keep an eye out for weird bends/lengths of tubing that could be used for various projects, plus they basically let you walk away with that kind of stuff...

 

Thanks for all the replys. I am pretty sure that on my 92 it uses at least 1 foot of rubber line between the hard lines from the frame to the throttle body.

At any rate I was going to get regular rubber fuel line from Advance Auto or Pep Boys. Being that one of the 2 hard lines is smaller in diameter do I have to get 2 different sizes of fuel line, or just buy 1 size and tighten the hose clamp down more on the smaller line? One other thing, can I just cut off those fittings on the throttle body hard lines and just hold the rubber line with a hose clamp or would I need to flare it or something before I put onon the line? Just want to make sure it seals and doesn't leak.

Thanks

 

Kind in mind, if yoiu ever take it to the track, you can not have any rubber fuel line longer then 12" (unless it's made for high-pressure applications).

 

All you have to do is go to the local parts store and have them cut you a length of rubber line made for TPI systems. This stuff can handle 60+ psi and I've used it in several application (most recently a Buick v6 swap into a TR7). There is no way you could rupture that kind of line with the 15 psi or so that you'd be running.

 

Is there a problem with running just regular rubber fuel lines that they sell off a big reel for the carbed engines?

I am not taking the car to a track, so I guess the length of rubber hose won't matter. I also don't need overkill, so if I can use regular rubber lines they sell for a carbed engine I would just like to use that. Of course I don't the hose to burst and have the car to catch on fire so if I need better line than the ones they sell for carbs I will get that. What do you think?

 

No, you can't use rubber hose which is for a carb'ed motor. Carb'ed engines only see FP of 4-6 PSI and the TBI will blow one of the weak rubbedr hoses all to heck!

Get some of the hose that 1MEAN92RS stated. That would work just fine.