TBI injectors dribbling fuel within the spray pattern

Is it possible that dirt or other foreign material is getting into the injectors or throttle body? An issue like this may require the assistance of the manufacturer.

I would like to say no, but when I installed the new fuel pump, I flushed and cleaned the fuel tank and run fuel through it before I allowed it to the TBI. This truck has practically everything new on it; except the ECM. I have retorqued the intake bolts and check for vaccum leaks (none). I have everything that has been suggested, I have spent enough money this TBI that I should have bought the Holley TBI.But like all, I was trying to save a dollar.

I built this truck for my 16 year old son, its been in the works for a year, now we have this fuel issue. I have checked the voltage not with a scope though, I have the required voltage to the injectors and they are pulsing according to the noid strobe.

Your injectors have a pulse voltage from like 5V to 8V. But this sure sounds like dirty, leaky injectors.

I know you have new injectors, I built pretty much the same motor, it took a while to get all the bugs out.

When the motor is running at idle, somehow block the fuel return line, then see how your spray pattern is.

I understand, but I tried 3 new sets of injectors hoping I kept I was just getting a bad one, but same result, I even put an adjustable fuel pressure regualtor and tried various fuel pressur settings. I have the TBI injector bolts wore out (lol). Is the relays behind the glove box.

Ok I will try that, when I block fuel line return if pattern changes, then what is recommendation.

What is the fuel pressure? Should be 9 to 13 lbs for the injectors. I put a fuel pump in my 95' for a 97' that will push 80 lbs. But the TBI injectors needs the 9 to 13 lbs pressure. Putting in a regulator in before the TBI is not accomplishing anything. I'm just thinking the regulator in the TBI is not right. I put the 650 cfm Holley TBI on mine.

That could do it definitely.

ok thanks for all your recommendations, I will try those and see what happens.

That holley TBI is like $585.00, that will be my last resort, I will try the aftermarket adjustable regulator one more time and replace the oring gaskets on the injectors and see what happens. I also just remembered a detail I left out. On the initial start when we discovered the fuel pump to be inop, I had my son pour some gas into the TBI to verify it was fuel pump, he got gas everywhere,at time, the timing was off and backfired, caught fire and burnt TBI wiring, I cleaned and rebuilt TBI, but one injector did'nt work, so rewired, and got power. Do you think that when I applied power, while wires were shorted may have done something to the ECM.

I gather you have not drivin this yet, with a motor like you built, you may have some other issues because of the OBD1 is set to run the stock motor. I had to get a custom chip programmed for my truck, to run the TBI set-up. I figure I'm pushing 400 hp. Just let us know.

I just replaced the ECC, seemed to have helped, I was looking for a more of a mist type spray pattern, but was wrong on that part. However, I now the same spray patterns. Once I get the exhaust on it so I can hear to readjust the right side rockers, hoping problem solved. I think I am only in the 330-350 Hp range. Thanks for your input. This has been trying, this truck should last my son through school and college if he takes care of it. Thanks again and God bless.

Sounds like the ring seal at the bottom of the injector is giving you problems, I had the same problem and went and doubled up on the o-rings and problem solved.