Fitech 600 Power Adder installed

[Chevman88]

Finally got around to converting to fuel injection with the Fitech 600 Power adder. For a fuel pump I installed an ep381 in-tank fuel pump, TBI blazer 31 gallon tank and sender, and all new braided stainless lines with filter mounted in the engine bay.

So far so good, only issues so far was a leaky fitting at the tank (of course it was the hardest one to get to) - tightened that down and no more leaks and now whenever I hit a bump my fuel cuts out until I let off the throttle. I'm thinking I need to clean up the ground at the tank as I reused the original ground. So far I like it, the self learning is nice and it allows for the eventual addition of boost. Will update this thread with any updates as I go along.

 

[ColoradoChevyK5]

I've got the same system with the exception of frame-mounted fuel pump/filters. I did as FiTech suggested, put in the initial start parameters, and then left it alone to the self-learning. Probably have about 10 hours on it now and it runs beautifully, though it was running great at say, five or six full run cycles. My only on-going issue is the stiffness of the linkage return spring tension. I've monkeyed with it but if I tip-in too quickly, I get an off-idle hesitation - very similar to a Quadrajet with a bad accelerator pump. If I tip-in carefully, smooth as butter. There's probably a controller adjustment I could make, but it's not even much of a concern. The system was a remarkable upgrade from the 39 year old Quadrajet. I'll be interested to see what you think in the future.

 

[ekajkrats]

eventual addition of boost

You'll have to post some pictures and videos when you do that!

 

[skunked]

I've got the same system with the exception of frame-mounted fuel pump/filters. I did as FiTech suggested, put in the initial start parameters, and then left it alone to the self-learning. Probably have about 10 hours on it now and it runs beautifully, though it was running great at say, five or six full run cycles. My only on-going issue is the stiffness of the linkage return spring tension. I've monkeyed with it but if I tip-in too quickly, I get an off-idle hesitation - very similar to a Quadrajet with a bad accelerator pump. If I tip-in carefully, smooth as butter. There's probably a controller adjustment I could make, but it's not even much of a concern. The system was a remarkable upgrade from the 39 year old Quadrajet. I'll be interested to see what you think in the future.

Post a picture of your linkage, specifically how it attaches to the throttle body. Also sounds like you could use some accelerator pump adjustments.

 

[Chevman88]

Post a picture of your linkage, specifically how it attaches to the throttle body. Also sounds like you could use some accelerator pump adjustments.

My linkage was binding before with the carb, I set it up so now it's much smoother. Stiff, but smooth. Also, there is a tip in adjustment you can make. Mine is doing the same, but not too bothersome.

Yesterday my blazer stalled out with a no crank situation. Knowing the PO had some shenanigans going on with the wiring I decided to go through anything dealing with the starter, ignition and fuel and clean it up. They had a 24ga wire that was tapped off the wiper circuit going to the (+) terminal on the coil. And they ran a whole new starter circuit using a push button that was tapped off the ignition circuit. The only reason I can think they did it that way was to avoid replacing the ignition switch and lock.

After cleaning it all up, no more fuel cutouts on bumpy roads and it runs much much better.

 

[skunked]

My linkage was binding before with the carb, I set it up so now it's much smoother. Stiff, but smooth.

The stiffness can be adjusted by moving the linkage attachment point on the fitech so you have more leverage. It’s been documented here on CK5 pretty well but I can dig up some photos for you if you’re interested.

 

[ColoradoChevyK5]

Skunked - thank you - I did read about that a while back when I was first trying to work it out. Like Chevman88, the operation of the linkage was smooth but with a higher spring rate than I liked. Part of the issue is using the factory cable bracket, the cable comes in at a very low angle/too close to the pivot point. Moving it to the highest attachment hole on the Fitech linkage helped a lot. Good to hear I can adjust the tip-in, I been through very few of the settings since it runs well as is. I'll try to get a couple pics.

 

[sweetk30]

got to make the lever arm longer and then adjust cable to make sure you get full throttle .

when i had my p.o.s sniper i added a 7/8" and that was about max with out loosing zero or full throttle range . it was better but still stiff .

before i got rid of it i popped off the 2nd link bar and it was SO MUCH BETTER fell . its the all 4 at 1 time pull that makes it hard also .

i am installing my edelbrock pro flo 4 today and its factory progressive linkage . should fell much better .

 

[Chevman88]

Just wanted to post back with an update. This thing is running really really good. Well worth the cost and install time of everything...including the PITA tank swap. No more splatter of unburnt fuel on whatever happens to be near my tailpipe on cold starts, starts first key turn every time, excellent throttle response. Now that everything is working like it should, I need to go back in and put on my wiring looms etc to make my engine bay a little neater and then I'll post some pics.

 

[skunked]

Just wanted to post back with an update. This thing is running really really good. Well worth the cost and install time of everything...including the PITA tank swap. No more splatter of unburnt fuel on whatever happens to be near my tailpipe on cold starts, starts first key turn every time, excellent throttle response. Now that everything is working like it should, I need to go back in and put on my wiring looms etc to make my engine bay a little neater and then I'll post some pics.

good to hear