ST FT bouncers between plus and negative 5. LT was at15 neg indicating a rich condition. Thought maybe a leaking injector. Checked fuel pressure and tada it's at 70lbs. It's supposed to be 52 max? Could the excessive fuel pressure cause an injector to seep?

 

Excessive pressure will throw off fuel trims. What you are seeing is the PCM compensating for the excessive pressure. PCM bases injector pulse-width on tables, that expect pressure to be in the neighborhood of 50PSI..... Yours is significantly higher than that, so, more fuel is added than the PCM thinks it is giving. O2 sensors notice the rich mixture, clues in the PCM, and the PCM dials back pulse-width..... WHY your pressure is high becomes the question. Bad regulator???

 

Put pressure at the line that comes from the fuel tank to the canister. Saw no smoke, but did see seepage at the fuel pump area. .The little stub at the tank with two hose clamps. I did apply more pressure that recommended for the evap system. Tomorrow I will apply vacuum to that .line.




rom the regulator to the fuel rail, so that is the guess here as well. I will double check pressure with a separate fuel pressure gauge to be sure.

 

Good Plan. May sure the gauge isn't just lying to you.

 

That is my thought too, because 30% high should kick a code?

 

Not sure what the criteria are for the PCM to finally complain about fuel trims.....

 

checked the gauge by using it to check tire pressure, then checking that reading with two gauge tire pressure measuring tools and one stick type. It could be reading more than ten lbs high.When your gauges are a combination of 50 year old stuff purchased when new, and newer HF, you have a hard time discerning the truth.

 

Even so, 60PSI is still too high, and would probably account for what you are seeing.

 

Found my second fuel pressure gauge and screwed it into the adapter, and it too read 70psi.

 

There is at least the majority of your problem. I *think* you can get the regulator as a separate part.