Tue Apr 20, 2021 7:07 pm
Tue Apr 20, 2021 7:50 pm
Tue Apr 20, 2021 8:08 pm
93celicaconv wrote:Just so you are aware, on a stock ST185, the fuel pump does not run when the key is turned to the ON position. The fuel pump only turns on with the ignition switch when the key is turned to the START position. There are a set of points in the AFM that, once the car starts and pulls air to open the AFM door a bit, the points switch state, which keeps the fuel pump running after the ignition switch is released on the ON position. You can call this a safety system so the fuel pump isn't left running after an accident or similar.
Tue Apr 20, 2021 8:15 pm
Tue Apr 20, 2021 8:34 pm
Tue Apr 20, 2021 11:36 pm
93celicaconv wrote:It's hard for anyone to provide assistance on vehicles that are not stock, because the non-stock modification options can be endless. However, if you have some modifications that others also have, then that subgroup can assist you. I just did not know what you had (I see you edited your post to indicate a modification now). Hopefully you will get your fueling issue resolved.
Tue Apr 20, 2021 11:39 pm
grip-addict wrote:nice work, looks tidy.
I had to do something similar when I was troubleshooting fuel pressure issues with my walbro 255. Ended up sticking a multimeter on its connector while going on a drive and was seeing 10 volts on the fuel pump circuit while it was under load. Yes, the resistor is/was bypassed and the pump is running flat out all of the time.
Since my battery's in the trunk, I just ran my relay directly from the positive there and grounded out the ground to chassis. Stuck my relay behind the rear-most plastic trunk cover thing. That really helped (but didn't fully fix) my fueling issues.
I think Alikazam was just sharing a modification he did recently and what symptoms led to making the change. It's nice to see other members attempting to help out though. Our small community needs the positivity since there are so few of us left
BTW in case anyone is thinking about it, fuel pressure monitoring is a game changer. Fuel is safety, and you really are rolling the dice when making modifications and NOT getting fuel data back. Yeah, you know HOW the system is supposed to react in an ideal situation, but you don't know that's what it is actually doing. it's such a roll of the dice.
ok, off my soap box for now
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