LT1 LT4 Fuel Rails

[Gio93z]

I installed a set of AFR heads which are LT4 based. My stock LT1 intake manifold was not wide enough so I had to buy an LT4 based intake manifold. The only way I was able to get my stock fuel rails (93 with crossover in the rear) to fit was to put a thinner o-ring on each of the rear crossover pipes.

I am assuming there are some AN adapters and a steel braided line set-up somewhere but does anyone have a first hand take on this.

I would only do the adapter set-up assuming a got a hold of a Vette LT4 fuel rail.


Thanks, Gio

[transmaro93]

i just ordered $150 worth of fuel line stuff for my lt1 tonight... braided line and all the fittings... they make an type factory fitting adaptors... they are like $15 a peice tho... you need two of each.... 2 for pressure and 2 for return... i opted to get one big length of braided line and got 4 -6an fittings so i can make my own lengths... the -6an fittings will fit onto the stock style fittings and there ya go.... stock rail braided lines...

[Gio93z]

so, you are running your stock LT1 fuel rail on an LT4 manifold? is that basically why you had to do what you did?

[transmaro93]

noooooo.... im running lt1 intake.... im doing this soi can relocate the fuel lines to clean up the engine bay... i dont think your having trouble with yours becuase its an lt1... your having trouble because the 93 fuel rail and intake is different from 94+.... what intake are you running stock GM lt4 or edlebrock lt4.... i think either way youll need a newer style fuel rail... can you take pictures so we can see what your working with a little better...

[sweetbmxrider]

i am thinking the same with needing a 94+ fuel rail. i'm sure you could run a couple fittings and braided line in place of the rear crossover but i am not positive on it.

[Pampered-Z]

I'll check with the Speed density guys.

[Gio93z]

right...im running the 93 style fuel rails - i should get the rails that crossover in the front b/c the edelbr. manifold has the recess for the rails in the front.....what i did was in the rear of my current rail, the 2 small lines that connect the left and right rails...i had to put a thinner o-ring in there b/c otherwise the rails are too wide and will not bolt to the intake manifold......

[Gio93z]

so in regards to getting a new fuel rail.......im looking for 94+ style rail for either corvette or f-body...?

[transmaro93]

yea... im not sure how the fuel lines connect on the 93's... but you should be good if you get a 94+ fuel rail.... if need be and your fuel lines dont match up... i can give you soe part numbers for a do it your self s/s braided set up that i just got in from summit today... but it was pricey that way...and if you run the lines in stock location you would probably need an extra 3 feet per line than i got... which is not a problem... just more money.... can you take a picture of your fuel lines.... see what ya got? and their location

[Gio93z]

ok gotcha...yea i'll def take some part numbers and get some pics asap.....

thanks

[transmaro93]

well you might be ok with the fuel line location.... and may not need the new hoses.. unless you want them...

[Gio93z]

well my plastic lines attach on the driver side towards the front of the intake manifold so with the 94+ rails, it looks like i would need at least a foot of line and 4 adapters.....

[transmaro93]

yea youll probably end up having to run 94+ fuel lines or switch to braided line... i have an almost brand new set of used fuel lines from my car (replaced last year).... i need the evap line but you can have the pressure and return line... i have no real need for htem.... for like $20... 94+ hook up on the driver side behind the intake.... how far away are you from the shore points.... im in brick..

[Gio93z]

im 162 off parkway north.......

[transmaro93]

aight well its up to you.. im not delivering them for $20 haha...

[Gio93z]

the lines you have go from the fuel rail hook-up....to.....the tank?

[transmaro93]

no from the fuel rail... to under the driver floor (where the hard lines start).... i only have the plastic lines...

[Gio93z]

gotcha - ok i will let you know for sure - my bro. lives off exit 117 so if i shoot down there i will let you know.....im kinda disgusted with the whole car at the moment so i need a minute to reevaluate things...but i will probably take the lines just in case - but i will probably just try and get the correct fuel rails and get some adapters and braided line to hook it up