3VZE hard starting?

[LedFloyd900]

I just rebuilt my 3VZE and it runs great, I ported and polished everything and it's bored .020" over and just runs great, however after sitting over night or at work all day i try to start it and it just cranks and cranks like it's not getting fuel. I can pump the gas a little like its carbureted and it helps some, but when it finally does start it sputters for about 5-10 seconds and then finally picks up and idles like it should. If I've been driving it and say stop at a gas station to get gas or something it starts right back up fine most of the time. Some times it'll take 2-3 seconds of cranking and sputter for a second but then pick back up and run fine again. I've had another mechanic tell me he thinks it may be the fuel pump or cold start valve (doubt it's the fuel pump tho, it runs perfectly fine after it starts), and the fuel pressure regulator is new, however the fuel pressure damper isn't (even though I highly doubt that has anything to do with it). I was curious if anyone else has had this problem and what the fix was, I really don't want to just start throwing a $140 valve and $140 pump at it in hopes that that's the problem

 

[Bad_Vision]

Are you using stock injectors or did you upgrade?
If your using stock fuel injectors with a P&P bore increase your air to fuel mixture for initial combustion will be wrong so it will start harder.

 

[LedFloyd900]

Are you using stock injectors or did you upgrade?
If your using stock fuel injectors with a P&P bore increase your air to fuel mixture for initial combustion will be wrong so it will start harder.

No they're upgraded. The engine was rebuilt by a bunch of f*cking idiots and ran for about 800 miles before a rod started knocking and I then rebuilt it myself. For that 800 miles it always started perfect and ran fine. I doubt it matters but I did soak the injector part of my cold start valve in acetone to clean off all the carbon

 

[Bad_Vision]

Might have melted the plastic with acetone. Or carbon built up and got into the injector and is blocking it from functioning.

 

[nicnmike]

The fuel dampner has been known to be a cause of hard starts when hot. I'm not entirely sure why. From what I read, as they start to fail, they may begin to leak and you can smell fuel. Another possible symptom/trick is you can turn the key to the on position, but not the all the way to start and let it sit for a few seconds and then try starting it. Finally, if you didn't use new crush washers when you reassembled the fuel lines, you maybe getting some leaking, or air in the lines.

 

[LedFloyd900]

The fuel dampner has been known to be a cause of hard starts when hot. I'm not entirely sure why. From what I read, as they start to fail, they may begin to leak and you can smell fuel. Another possible symptom/trick is you can turn the key to the on position, but not the all the way to start and let it sit for a few seconds and then try starting it. Finally, if you didn't use new crush washers when you reassembled the fuel lines, you maybe getting some leaking, or air in the lines.

Well yea I've annealed all the crush washers so nothing is leaking, and it only has troubles starting after sitting for a while like over night or at work. The longer it sits the longer it takes for it to start