Fuel leakdown

[Bcrump1984]

So after installing the new injectors, fpr and distributor I finally have my 96 with the 7.4 running but I am still showing a fuel pressure leak down when key is turned off. I cant visibly see a leak up top nor smell fuel. What are some other possible culprits that can cause this?

 

[movietvet]

Fuel pump?

 

[PlayingWithTBI]

I'm not much of a Vortec guy but, FWIU it can be a leaking pressure regulator, leaking spider, bad check valve in the pump, etc.

 

[Bcrump1984]

I'm not much of a Vortec guy but, FWIU it can be a leaking pressure regulator, leaking spider, bad check valve in the pump, etc.

Brand new regulator. I was thinking fuel pump. Possibly lower intake but idk?

 

[Komet]

Could be poor check valve in the pump. Does it hold pressure if you pinch the return?

 

[Bcrump1984]

Could be poor check valve in the pump. Does it hold pressure if you pinch the return?

Idk haven’t checked. I know you cant pinch the metal lines at the regulator or along the frame. Is there a rubber line somewhere at the fuel tank to pinch off? I have never done any of this stuff before.

 

[Schurkey]

Aren't the 7.4L engines known for leaking injectors?

 

[Bcrump1984]

Aren't the 7.4L engines known for leaking injectors?

Already replaced them with the bosh 4 hole. Its possible I didnt get them seated all the way but otherwise that shouldnt be an issue anymore.

 

[Schurkey]

"Shouldn't" doesn't mean "Isn't".

More diagnosis needed.