LB7: Fuel pressure regulator performance code

[WolfLMM]

2001 lb7. New top end; head gaskets injectors lines etc. had some problems early but have the truck running and put some miles on it. Everything looks great balance rates within one, no other codes.

Rail pressure is at 10k. Commanded is 5k. Has a definite bump to the idle.

Am I looking at a new fuel pressure regulator here? Hung up?

This dang truck is determined to beat me.

 

[paint94979]

Sounds like a stuck regulator. What happens during highway driving, does actual follow desired?

 

[WolfLMM]

Couldn't tell you, I'm watching in burn in the front yard

 

[mike diesel]

Do you have a lift pump?

 

[WolfLMM]

Nope

 

[paint94979]

I don't see why having a lift pump would matter?

 

[Chevy1925]

I don't see why having a lift pump would matter?

Too high a pressure from it can cause a weak reg to hang open at or near idle

 

[dmaxbowtie]

I would also think the fpr is sticking and should be replaced

 

[paint94979]

Too high a pressure from it can cause a weak reg to hang open at or near idle

You're wrong James

 

[WolfLMM]

Wonder what breaks next? Truck is determined to give me trouble.

 

[Chevy1925]

You're wrong James

More that likely

 

[sweetdiesel]

You're wrong James

No he isn't. I can watch rail pressure change on lots of vehicles just by turning on the lift pump.
Nick, it's a regulator and it's job is to adjust the pressure, if it sticks or has a lot of pre_ charge due to a lift pump it has to react....

Honestly Wade,I would not worry to much about it!
Logging at mid and wot would be a good idea though. If the truck hasn't been running for a while....drive it and see if the regulator loosens up.

 

[dmax02]

I have a new regulator i will sell cheap if you need.

 

[WolfLMM]

Pm me