Tbi swap build thread

[pancake]

Hello again,

Well you guys were right....it was/is a vacuum leak!!

When I installed the trans-dapt 2206 adapter plate, two of the bolts that hold the TBI in place are positioned directly over the edge of the spreadbore on the intake!! when I tightened these bolts down they crushed the intake where it sealed to the adapter plate!! I did not think I was applying that much torque, the bolts went in really easy..but did a lot of damage to the soft intake.

Well, I ordered another intake after finding the problem. I think this will "fix" my leaks.

As for the fuel pump...I do have a summit feul pressure gauge, 3/8 aluminum line to and from the tank, and a TBI fuel pump mounted inside the tank. I will check the voltage going to the pump and will also try moving the fuel pressure gauge closer to the tank to see if I have a kink or restriction in the line somewhere.

Is there a way to remove the intake so that no coolant gets into the oil? I am tired on buying 5 quarts of oil every time I pull the intake off. I do drain the raditor before removing but there is always some coolant left in the intake.

Thanks again for all your help and Happy Holidays.

Pancake

[68 TT]

Originally Posted by pancake

Hello again,

Well you guys were right....it was/is a vacuum leak!!

When I installed the trans-dapt 2206 adapter plate, two of the bolts that hold the TBI in place are positioned directly over the edge of the spreadbore on the intake!! when I tightened these bolts down they crushed the intake where it sealed to the adapter plate!! I did not think I was applying that much torque, the bolts went in really easy..but did a lot of damage to the soft intake.

Well, I ordered another intake after finding the problem. I think this will "fix" my leaks.

As for the fuel pump...I do have a summit feul pressure gauge, 3/8 aluminum line to and from the tank, and a TBI fuel pump mounted inside the tank. I will check the voltage going to the pump and will also try moving the fuel pressure gauge closer to the tank to see if I have a kink or restriction in the line somewhere.

Is there a way to remove the intake so that no coolant gets into the oil? I am tired on buying 5 quarts of oil every time I pull the intake off. I do drain the raditor before removing but there is always some coolant left in the intake.

Thanks again for all your help and Happy Holidays.

Pancake

Pulling the bottom bolt on the passenger side of the water pump should let the coolant in the top end drain out so there won't be any high enough to dump out of the heads into the intake valley. You can then pull the thermostat and use the shop vac to suck out all the coolant left in the crossover passage of the intake.

[rfmaster]

Originally Posted by 68 TT

Pulling the bottom bolt on the passenger side of the water pump should let the coolant in the top end drain out so there won't be any high enough to dump out of the heads into the intake valley. You can then pull the thermostat and use the shop vac to suck out all the coolant left in the crossover passage of the intake.

Great tip 68 TT

Any update on fuel pressure??? Another all too common reason for low fuel pressure is a bursted fuel hose between fuel pump output port and gas tank feed through (inside gas tank). Remember, that small piece of hose must be have fuel submersion rating - SAE 30R10! Anything less than that will result in a slow leak over time!

Happy holidays!


//RF

[pancake]

A little cold here (Colorado) so I have not worked on the truck too much latley....so no update on the fuel pressure. I did replace all the fuel line with 3/8 aluminum with 3/8 high pressure rubber fuel line attaching it to the tank and the TBI. I also replaced the fittings on the tbi so I could put -6an to 3/8 barbed of the TBI. I might be a weak fuel pump? I will have to see when it gets warmer. I did receive the intake and gasket kit so I will also be replacing them when it warms up a little

Happy Holidays....Pancake