Throttle body CFM VS engine Cubic inches?
I think it's a bad gauge, a new jegs one. I used my remote starter switch and hooked it up at the fuel pump connector and battery, so i can just push the button to run the pump. Pressure was the same. It looked like it was hitting a stop at 12 psi, I counted wrong before I thought it was in 5ths. So I hooked the gauge up to my hand pump for the boat. I could not get it above 12psi. squeezed till fuel went everywhere. So I hooked up my fuel/vacuum gauge to the fitech, It only goes to 10psi. But ran the pump and it spun the gauge way past 10. Drove it the first time after resetting everything and cleaning the injectors, the lean tip in is gone. Probably from the dirty injectors. AFR trim learn is at 75% i was told that will come down as it learns, guess will see.
Son of a gun! Yep, I had my gauge fail on me too. It was a fitech gauge. I since put in this one, and it's real stable now.
Thanks, I’ll return the one from jegs it was brand new.
I had a Summit pressure gauge that failed new. Gas was pouring through the glass pushing all the silicone and gas out. It made a big mess. I exchanged it (at their expense) for a FiTech. Oh well, now I read this, and I should expect the FiTech to fail, but good for now. It is one thing not to measure right, but is another thing to let gas out. The latter is more dangerous. My tool kit now includes a 1/4" NPT plug just in case I have a leaky gauge in the future.
Something else that I thought about. Check your CPU plug. If you have the wire feed to the fuel pump through the CPU, the wire harness and connector may not be robust enough to handle the power to the pump, at least the older CPUs didn't. I think the newer CPUs have revised wire harness.
Read this: https://fitechefituning.com/fitech-efi-tuning-forum-2/topic/6-pin-connector-melted/#postid-5076
That plug looked good. That’s how I sent power to the pump. If the regulator is good. Till I wait for the new gauge. Would it be safe to assume that I’m getting the right pressure if I have fuel flowing out the return.
After restoring the tune back to default. I had to set the Afr learn to max to get it to run. AFR learn eventually settled to 75%. Drove around everywhere today and the lean tip came back. At high loads it would go very lean. Just for the hell of it. I turned off closed loop. Idled rich and adjusted the cam 1 table till I matched my target afr at idle. Took it for a quick drive and it actually ran better. The lean spot right off close throttle wasn’t as bad. Still lean at high loads. It would be nice if you can log the afr error and adjust your VE table off that. Like how I’m used to tuning speed density.
Pulled the fuel line off today and ran the pump into a bucket. Fuel just trickles out. Guess it time to pull the tank.
Got the problem fixed. I dropped the tank, the pump was barely on the line. The zip ties they said say to use in the instructions fell off. Which caused the pump to rest on the bottom of the tank. The inlet also had a bunch of crap in it. Cleaned everything out, Tied the pump with safety wire, and put a hose clamp on the line. I then reset to default tune. Fired right up and had over 100 psi, with same gauge. My AFR learn before was at 85%, now with out changing anything its -7%. I changed the Pump PWM to 37, that brought the press down to 50 psi at idle. So i think i should be good now.
Just thought about the regulator, It should not let the pressure go that high. Got to look into that.