[TitaniumTT]

Originally Posted by albertomg

Congrats on your amazing results.

Rich/Goodfella has a good write up on fuel pumps on the other forum in the Archives.

What are you using for a fuel filter? Stock or some kind of aftermarket K&N? Have you ever dropped the gas tank and cleaned it out or at least inspected the inside?

I was running a Marren replaceable/washable stainless steel filter. I changed that out for a much larger Aeromotive filter and datalogged the pressure differences. There is less than 1psi drop across the Aeromotive. The Marren was higher even after cleaning it. I'm currently running the Aeromotive.

The tank was in excellent condition. I cleaned it by hand as well. The contamination wasn't in that tank.

Originally Posted by Double_J

Did you find out why you were having a FP drop? I too was tuning my car on the dyno, and all of a sudden my FP dropped. My car was running with a new supra pump, and filter. I would love to hear what happened to your car as I have not figured mine out yet.

I did, it turned out to be the wiring afterall. What was happening was the wiring was getting hot on the dyno after all the abuse it was taking. 57psi run after run after run after run and eventually the wiring would get warm, causing resistance, causing the a drop in voltage causing the pressure to fall like a rock. It was an unfortuneate set of events that basically started @ DGRR '09. Anyone with me witnessed me testing the first filter by pouring acetone and fuel into the filter and having the filter hold it like a cup of water. After that and popping an engine on the dyno from a clogged filter I was convinced that was the problem even after it was solved which is why I kept on chasing contamination and bad fuel pumps. In the end though, after I replaced a known clogged filter and a known bad pump, the problem persisted (although it was taking MUCH longer to show up) and we finally found it to be the wiring. Basically Dave and I were running the car and as soon as the problem showed up we tested the wiring - WHEN IT WAS WARM - found the voltage drop, jumped it from the battery and the problem was gone. So we jury rigged some wiring till I got home and could properly strip everything out and run some marine 10ga wire. Haven't had a problem since.

Lesson being, if you're chasing your tail, theres a good chance that there is no problem to be found were you're looking.