Deceptivex

Ok... 01 Silverado built lq9, 243 heads stainless valves ect... 600 lift truck cam.. 9 inch fabricated aluminum intake 102mm tb.. Using stock fuel lines with 6an adapters, billet fuel rails. The fuel system doesn't hold fuel pressure after the fuel pump shuts off... unless I clamp the return line shut.

03sierraslt

iTrader: (22)

Stock or aftermarket regulator?

Deceptivex

Aftermarket regulator, billet fuel rails 60lb injectors

Deceptivex

Aftermarket

03sierraslt

iTrader: (22)

Did you read the instructions that came with the regulator? Majority of regulators are not designed to hold pressure when the engine is not running and it even says so.

I know mine doesn’t. Does it start OK

Deceptivex

It starts fine, no Instructions came with the fpr. I had a feeling that perhaps it was normal, but this is my first build like this so I wasn't sure. I appreciate the info! Now I've gotta figure out the running rich issue... paid a tuner to bench tune my ecu for my 8.1 marine 60lb injectors...blue ones off eBay, not sure he got the tune right maybe bad info for injectors idk... But I bought HP Tuners so I can teach myself how to do it and get it right.

03sierraslt

iTrader: (22)

What base fuel pressure did you tell him? And what’s your base set at?

Deceptivex

I set base at 58 as per factory... but in the tune it looks like he may have set it for 42. I don't remember if he asked me or I told him even it's been awhile, but the truck is running so rich it is putting black soot out the exhaust... long tubes and 3 inch dual exhaust... and depositing fuel into the crankcase