Please help need facts from mopar techs!
For about 1 week 04 qc ram 5.7 hemi 4x4 is giving me extended cranks before start up.
Some time fires right up some times 3 to 5 sec crank is required
Seems to act up more when warm when just shut off recently
And I ask it to start shortly after it just ran. I put a new fuel pump in it in December( got truck in nov) because plastic at top of sender rotted and leaked. Fuel pressure drops to 0 key off instantly , pulled fuel rail up because brand new pump but no leaking injectors . ? Should fuel pressure hold after shut off to a degree .
Does pump have check valve?
Thanks for help

 

Anybody have opinion

 

Any codes thrown? Not for sure about the fuel psi; but hot/warm restarting issues is often a sympton of a crank or camshaft position sensor. Did you change the fuel filter after replacing the pump?

 

No cel no filter

 

Back in the day when I was a full time mechanic fuel injected engines were supposed to hold 80% fuel pressure for 24 hrs does this
Therory not apply to 04 hemi?

 

My dakota does this too, strarts right up when cold, has trouble when its warm

Whatching Post!!!

Sorry I was of no help

 

Not trying to b pushy but if anybody has 04 hemi and a fuel pressure gauge It would b awesome if u could check to see what fuel pressure does when u go to key off. Thank you thank you thank you

 

I think it's vapor lock due to bad check valve in fuel pump
But not 100% anybody know if total fuel pressure drop key off is normal ?

 

There would still be slight fuel pressure with the key off. Anyone who has changed a cam and pulled the engine apart can verify this because when you push the Schroeder valve a little fuel does come out. However, it does not gush or spew out so it is not a lot of pressure

 

I mean a readable pressure
Running 62
When I shut mine off going by fuel pressure gauge it goes from 62 to 0 in 1 sec.
Shouldn't it drop to like to 40 then just a gradual drop from there. Ram acts up on hot days when engine is brought to temp then shut off and you try start 5 to 10 min later. If you star it right back up before gas has had a chance to boil it starts fine.