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question, if it is a check valve, why are the pressures different when it is hot or cold?
why don’t I have ~60 psi everytime I turn on the key, regardless of hot or cold?
I would default to jimmyblue's explanation below for that one:
Originally Posted by jimmyblue
Hot fuel in the rails will raise pressure there and force it
against the checkvalve's ability to hold pressure, and it
will do that until fuel has left the rails (vapor, you can get
lots of volume where cold gas would quit pushing shortly).
Then you have a void to fill, in a dead-head system that
can only be done with a lot of pedal (opening the injectors)
and time@pressure.
A check valve that leaks back a little, cold, but leaves
the line full (enough) can be a real problem hot when you
have a vapor push wanting to have a go at it.
Either way, the rapid bleed down is indicative of a problem with the pump module (unless there is an external fuel leak). The pressure has to be going somewhere that it shouldn't.
I would default to jimmyblue's explanation below for that one:
Either way, the rapid bleed down is indicative of a problem with the pump module (unless there is an external fuel leak). The pressure has to be going somewhere that it shouldn't.
thank you for your respected replies along with Jimmy blue’s.
I do believe the problem is in the fuel tank. I don’t plan to cut a hole in the trunk for access and will only drop the fuel tank if the problem gets worse since this car is mostly a garage queen.
I sure wish the solution was an easier fix.
I will report back when the problem must be fixed.
until then, this is just another thread with no real answer to this issue many have reported over the years.
I still plan to make a follow up video showing the pressure symptoms when the engine is hot
I did some reading today and as stated before, look to the fuel tank.
hope this helps someone answer their question to this common issue.
In my situation and according to the manual, it is either the Fuel Injectors (which I doubt) or one of two items in the fuel tank (Fuel Pump or Pressure Regulator).
I don’t think it’s the fuel injector(s) because I cycled ignition (key on, key off) 10 times and the engine started right up and no black smoke, stumbling or raw fuel smell.
if it was leaking injectors, I should’ve had a flooded condition.
I think the OP has the cause of this narrowed down and likely figured out, sounds like it's just a matter of if/when the issue gets to a point where he wants to repair it.
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