need a little help on a tpi swap

[birdman8711]

the low pressure wont starve the high pressure and are you talking about the low pressure being a puller or in tank

[Andy4639]

You have a few ways to get the gas out of the tank. One is build a small sending unit tank to mount under the truck to the frame. Put a electric pump in line to fill it are gravity feed it. It will also house the pump for the motor and the return line.

The one I like the best is. Take the orignal tank out of the truck and measure the bottom front side of the tank and build a box to weld to it. Mark the tank where the outline of the box. Drill holes into the gas tank and weld a fitting for the fuel line into the new box then weld the box to the tank. Then use a inline high out put pump to the motor with filter on both sides of the pump.
Are buy a fuel tank for fuel injection and mount it in the frame.

[birdman8711]

ok guys engine and trans are in and moving along now im having an issue with my driveshaft i have a 72" single piece and need a 69" or 70" i was wondering if you know of any gm vehicles that have one or should i just get mine cut

[mmiddle]

Get it cut, they will balance it and all.

Post some serious pics when you are done. I have two 87 IROC's and was thinking about taking one of the TPI's out for my sons 75 stepper.

[Andy4639]

I'm fixing to have a complete combo 305 HO TPI/700R4 took out of my 71 to be replaced with a 6.0 LSx. If anybody is intersted PM me. Complete Street & performance wiring harness 4 wires and it's running.

[MalibuSSwagon]

Originally Posted by mmiddle

Get it cut, they will balance it and all.

Post some serious pics when you are done. I have two 87 IROC's and was thinking about taking one of the TPI's out for my sons 75 stepper.

check out my build thread in my sig, I have converted my 86 C10 to TPI.

[MARKDTN]

I did not see the photos well earlier. I would not use those brass unions, especially on the pressure side. Those gas unions are made for 4-5 psi and are being used at over 40 and even higher at times. You are much better off to use hydraulic unions that are rated for high pressure. You do not want leaking pressurized fuel.

[68 TT]

Originally Posted by birdman8711

ok guys engine and trans are in and moving along now im having an issue with my driveshaft i have a 72" single piece and need a 69" or 70" i was wondering if you know of any gm vehicles that have one or should i just get mine cut

If you put the engine in the forward mount holes it can use the 72" driveshaft but I would have the driveshaft shortened and keep the engine set back in the rear mount holes for a little better weight distribution and more room up front for the accessory drive.

[Orange Crate]

I am also swapping in a TPI and have read as much as possible hear and other places. One write-up I saw was concerning the return line back to the tank. The guy didn't put the return line all the way down to the bottom of the tank, sort of had it dumping in at the top. The issue was the fuel got aerated and he had some hesitation issues because of air in the fuel going into the pump until he figured out what was going on. Anyway I thought it was a good tip. Here is a good site for general TPI info:

http://www.chevythunder.com/

[Longhorn 70]

I have always liked the looks of the L98 TPI mills. I had one in a 90 Corvette. It had so much grunt down low. It always seemed to me that it would have been a better truck engine than sports car engine.

Great gas mileage, reliability, reasonable performance, and sweet looks are just a few of its assets. I have thought about putting one in my pickup but never did. Please post pics of yours as you go along. I'm betting it will be a great ride.

[birdman8711]

this is my fuel pump and filter combo im using my stock tank will upload a pic of my sending unit once its done. its a walbro inline pump 60psi max($112 from summit) and a stock replacement filter for my camaro which is a 10 micron($15 from autozone)

[Z10]

Interesting thread. I've ordered a F.I.R.S.T TPI system and hopefully will it will be delivered in the next couple of weeks. It's going to sit on top of my ZZ4. This set up is pretty much a factory TPI system on steroids.

[jaros44sr]

Originally Posted by birdman8711

this is my fuel pump and filter combo im using my stock tank will upload a pic of my sending unit once its done. its a walbro inline pump 60psi max($112 from summit) and a stock replacement filter for my camaro which is a 10 micron($15 from autozone)

Just a heads up, i THINK the threads in your fuel filter are ORS and not NPT. If im right, you will have leakage. Hope im wrong, but check it out

[birdman8711]

okay guys im picking up another tank with the eec and im thinking of either doing a sump box on bottom of the tank and having the fuel line come out of it into the fuel pump mounted on the rail or pulling the camaros fuel pump and mounting it in the tank which do you guys think would be better

[birdman8711]

is anyone here using the vapor canister with their swap and if not what did you do instead

[birdman8711]

okay guys i need some input im trying to prime the fuel pump but so far not having any luck any help is greatly appreciated

[Bigdav160]

Which is the inlet and which is the outlet? The filter should be on the outlet side not the inlet. Is you pump mounted below the tank?

[Andy4639]

I don't care what anyone says about baffeled tanks. U are in for trouble with out them. Once U run down the gas level it will slosh it all over the place. The fuel gauge will read all kinds of levels after U used about a 1/4 of tank of gas. On top of that U will pull air into the pump and cause it to faill once your down towards the bottom of the tank. I know from past experience and I've had mine in the 71 since 1989.

I have one of the first Street & Performance wiring harnesses in my truck. I run a v-6 Ferieo computer with a modified v-8 chip.

[birdman8711]

i have the filter before the pump to prolong the pump life as the pump is $90 and the filter is only $15 and yes its below the tank mounted on the frame as close as possible to the tank and im using the stock sending unit which i added a return line to so the pick up is only a 1/2 inch from the bottom of the tank and last i checked i had 7 gallons in it so it should be close to half full

[Andy4639]

Are U sure the pump is coming on? It may take it a little bit to prime it since it's a inline pump pulling the fuel up the sendor then to the pump.
This is beeen a problem with in line pumps since the beginning.

[Z10]

Or.....you could use a surge tank. I'm building a TPI system also. This will be mounted between the fender and battery.


Follow along on my build.http://67-72chevytrucks.com/vboard/s...=1#post6356218

[Andy4639]

Originally Posted by Z10

Or.....you could use a surge tank. I'm building a TPI system also. This will be mounted between the fender and battery.


Follow along on my build.http://67-72chevytrucks.com/vboard/s...=1#post6356218

That was one of my first suggestions long ago about using a gravity feed line to a tank under the truck with the electric pump and return line built into it. We did this years ago on a TPI install. Carolina Rod shop use to keep these in stock just for this.

[Z10]

Few more pics of what's going on inside the surge tank.
http://67-72chevytrucks.com/vboard/s...=1#post6356218

[birdman8711]

okay guys got the fuel system primed i ended up just using a multi use transfer pump from harbor freight to pull the fuel through and it only took about 2 minutes to do

[jaros44sr]

Heres the answer to your PM, the adapter to the fuel filter is ORS, i can give you thread and pitch if needed. The other end of the adapter is AN barrel nut and sleeve, your choice on how you want to terminate
The filter is not NPT


20131203_110123 by jarosaj, on Flickr