1999 silvarado with 5.3 (fuel press. regulator)

[cvanderweyst]

I changed my fuel pressure regulator today and shortly after starting my truck i began getting an intermitent noise coming from the back of engine or under the truck. When i remove the vacum line from the pressure regulator the noise stops. Has anyone ever experienced this?

[Jeremy airjer W]

How about if you pull of the vacuum hose to the regulator and put your finger over the end of the hose to stop the vacuum leak?

[cvanderweyst]

if i pull the vacum line off the noise stops and if i put my finger over the end of the vacum line it stops.

[Jeremy airjer W]

The vacuum line fits snug over the new pressure regulator nipple?

[Big Buck Buster]

if i pull the vacum line off the noise stops and if i put my finger over the end of the vacum line it stops.

Have you put a fuel pressure gauge on it since you put the regulator on it?

Check to see if the fuel pressure is bouncing around when it is making the noise.

[cvanderweyst]

I returned the regulator to the store i baught it from and they gave me a new one and it fixed the problem. I baught the part from the lower priced store in town($25 cheaper)it makes me wonder about the quality of their parts.

The diameter of the nipple that the vacum line attaches to is smaller than the stock one, but it does have a flared end, so it does not fit as snug

[Jeremy airjer W]

I'm not saying the cheaper one is not a good idea but!?!?!

[deadeye]

I wonder what the noise was? Loose diagphram or spring?

[cvanderweyst]

i was told it was a vacum leak causing the vacum canister to buzz?

[deadeye]

Oh, that would make sense. I suppose thats connected to a solenoid of some kind. I forget the name of it, but that makes perfect sense.