No HIgh pressure schrader valve Vp GSI ??

[Shaper79]

Why? I can take pics tomorrow of engine and lay out. But it's strang. There is no schrader valve to check Hp fuel pump. Nor is there a fuel regulator. Just Two line from the fuel cell to back of Throttle body FI. 5.7 GSI. Any

 

[alldodge]

Not a VP guy but I have never seen a shrader valve on a motor with TBI, only MPI. You would need to use a fitting like the Merc 91-806901

 

[Shaper79]

Ho. Ok. So I would have to install this inline on the HP pump line to check HP fuel pressure. I think I may have found the fuel pressure regulator. I think it's mounted on the left side of th TB. And a little rubber line goes to it from the fuel cell. I'll snap som pics tomorrow. Just wanna clean the screen on it. If it has a FP regulator. Thx

 

[Scott Danforth]

TBI isnt high pressure. Its 1 bar (15psi)

 

[Shaper79]

Ok. So I guess that explains why there is schrader valve to Check HP fuel pump. I cleaned both pumps and screens. And low pump psi now at 6. I could easily suck gas from the main fuel line from Thank. That would tell me anti syphon valve is good. I installed a new cap. The old had corrosion on the inside points. And was not marine quality. Got the VP cap now. And It seems to run absolutely perfect on the muffs now. And great full spray out of both TB injectors. On reve ups. , Now for a the lake test under , load. Just wanted to make one final test on the HP fuel pump Psi. But no way to hook up with to it with my gage. That's why I was asking, But I guess if I'm getting massive spray. Then it's all good. Thx fellas