i am working on a 2000 ram with a walbro pump what is the fuel line pressure suppose to be before the lift pump? everything else on the truck is stock.

 

Which walbro?

 

i am not sure it was on the truck already. but it has a check valve system that looks like it bleeds pressure back to the tank if it gets to high. it has more power half power throttle than full

 

I believe that mine was factory set at 20 psi. Mine is a 392.

Have you changed your fuel filters? Is there a pre pump filter?

 

no pump filter but there is the valve six inches from the pump i think that might be sticking open at wide open throttle. has anyone ever heard of that?

 

Do you have a FP guage?

What color is the bypass valve?

If it looks like this, you got gyped...

 

ya i have a gauge it reads 20 at idle and drops like 10 psi when i step on it.

 

the valve is brass

 

Ok, so it's the right bypass.

Is 10 as low as it goes?

I run mine at 10 PSI, I can suck mine down to 5 psi when everything is set to kill.

Where do you take your fp reading at?

 

i think it is from the lift pump a port off of it

 

if i floor it it bogs than i let out a bit and it takes off

 

Hmmm... as long as you have positive pressure, you should not be having problems related to FP... I could run mine down to 0 before it would stutter.

2nd gen... right? Could be a VP issue...

Have you changed your Fuel filter?

Any codes?

 

no codes and the vp was changed two weeks before i got it like 4 weeks ago and yes to the filter i am lost

 

check air filter