Re: Trouble finding anyone to work on 2005 Crossfire
Originally Posted by
GraphiteGhost
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I have an interesting question/point? IF the fuel rail is already pressurized, will the fuel pump run after turning it off and on repeatedly trying to start it initially? I've not heard it after shutting it down and restarting it during the day (and BTW, how much does it self-bleed the line pressure). In another instance, my 02 Camaro will ONLY run the pump when starting (or attempting to if no fuel pump issue) the first time. After that (within a certain amount of time) it will not run to pressurize until the set minimum pressure switch runs it again. Always wanted to ask this question, as I do not remember the pump on my crossfire (after the initial first start) running for the rest of the 'trip' that didn't involve a long delay in returning to the car (shopping, and the like). If this is the case, then trying to 'hear' the fuel pump running after a first attempt (when the system is pressurized and not starting due to a lack of fuel pressure) is kind of 'moot', or am I missing something?
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That is a really interesting question. I think in all my cars the fuel pumps seem to kick in automatically for a few seconds when the key hits the on position before going to the start position. I figured it is because all systems are coming on-line at the same time so as soon as the key hits the on position on the way to the start position the fuel pump kicks in and the pressure monitor that tells it to turn on/off is also coming on-line at the same time. I guess I've never tried shutting down and then immediately turning the key back to the on position to see if the pump comes back on right away again or not. There has to be back-bleed and loss of pressure after a certain amount of time as there is no 1-way valve that opens and closes to maintain pressure in the fuel system after a shut down that I know of... It must lose pressure at some rate as the system de-pressurizes. Pressurizing a liquid is virtually instantaneous unlike air. I can't imagine any fuel system that is pressurizing liquid gasoline can hold it for long... We're talking about a few milliliters of gasoline getting pushed into the fuel system that develops functional rail pressure. I mean, take a sealed gallon of water and try to squish it... Ya can't.
Last edited by Deepsea21; Jul 6, 2022 at 08:44 PM.