Fuel Pump?

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Jan 14, 2010 | 10:32 PM

#31

alloro

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Quote:

Originally Posted by pdqford

I'm guessing that includes new wires. I do know that the Mopar 360 is very fussy about how you route the spark plug wires to prevent inducing a spark in an adjacent wire if they run parallel and close to each other.

<thread hijack mode on>
Yes new wires too, new O2 sensors and a PCM as well. BTW, it's the 3.9L which is basically the 360 with 2 cylinders chopped off. I did the routing of the spark plug wires as per the TSB even though it didn't apply to my model. Are you sensing my frustration yet? LOL
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Jan 15, 2010 | 10:23 AM

#32

jaywbalk

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Joined: Jan 2010

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Quote:

the truck does have a fuel rail pulse dampner so if you remove the vac from it nothing would happen, it's not a pressure regulator

Quote:

the fuel pressure is regulated by the speed of the pump controlled by the pcm reading the fuel rail pressure temp sensor

Yeah the thing that I pulled didn't even have a return line on it. Wasn't paying very close attention. Oops! So that makes sense. By this explanation then, maybe it's the "fuel rail pressure temp sensor" or the pump? Where is that sensor? I don't see anything else on or near the fuel rail.

And pdq, thanks for the explanation! I'm looking into the EVAP purge valve because that also makes a lot of sense too.

In the mean time, the truck is still starting and idling just fine and the CEL hasn't returned since I checked the injectors.

Thanks again guys, for all of your help!

Jan 15, 2010 | 10:36 AM

#33

fordtech08

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Quote:

Originally Posted by pdqford

The EVAP canister holds fuel vapors from the fuel tank in a charcoal medium. Under certain condictions (i.e, when the all-knowing PCM decides that dumping the fuel vapors into the intake will not cause a driveability issue), the PCM will activate the EVAP canister purge valve and the gaseous fuel will get sucked into the intake. If the EVAP canister purge valve doesn't shut all the way (for what ever reason) it could allow extra fuel to get into the intake when it shouldn't. (See P0172 and P0175)

the problem with that is the evap has sensors that can tell if there is a leak like the valve being stuck open, since he doesn't have an evap code then there is no leak