Im running a stock replacement mech fuel pump and q-jet. I was wondering what type of fittings are on the fuel pump and carb because I plan on adding a fuel pressure guage and a regulator (if needed). Is it a good idea to add a inline fuel filter in between the pump and carb or should I just use the stock one thats in the front of the carb?

 

with a stock replacment type pump you shouldn't need a regulator..

if you want a pressure gauge.. a "T" a pair of 3/8npt fittins for hose, on each side. and a 1/8npt hole for the gauge should do ya fine.

 

Converting over to an external fuel filter is one of the first things I do when getting set up to use a QJet on a performance motor. The stock filter in the nose of the carb is fairly restrictive. My favorite go-to external filter is the Fram G3 see-through filter. It's got a clear external plastic shell so you can see when the filter is getting dirty and it uses 3/8" in/out fittings on the end which is the same size line as your QJt already uses. The filter inside is not replacable but the whole unit only costs about $5 and it flows like crazy. Cut out a section of the factory hard line and plumb the fiter in using short lengths of rubber fuel line hose on either side. Double-clamp everything to prevent leaks, or better yet- ditch the whole hard line and re-do it in braided steel line from the pump, through the filter, all the way up to the carb.

No regulator needed with a factory mechanical pump.

Fuel pressure gague fitting in addition to that is easy to do if you're cutting into the factory hard line to do an external filter anyway.

 

Whats everyone running for a fuel pressure guage on the q-jet?

 

The stock fuel pump has a non-adjustable pressure regulator mounted on the bottom of the pump.

 

hey, sorry to let you all down but its not 3/8 npt. Its 3/8 inverted flare. NPT or national pipe tread wont fit and you'll only strip the hell out of everything. I wanted to use the cool chrome ones from Pep boys but they are also NPT, so I had to go to Autozone and tell them I needed 3/8 inverted flare fittings. Depending on whos behind the counter you may have to bring in your old fuel pump so they can see what an inverted Flare lookes like. The inverted flare fittings go in so easy you'll think it will leak, but it won't. I put the chrome simulated steel braided tubing on my car and it looks a lot better and you don't have to worry about kinking your fuel line when changing filters, and you're fuel wont have to run right next to the hot engine!

 

NPT threads are always MUCH larger than 3/8". NPT thread should be called "doesn't correspong to anything" thread. It's unique and can't be compared to anything else. 3/8" inch LINE is what feeds to a QJet carb- as in you can put a 3/8" hose over the hard line it and clamp it down, but the hard screw-in fittings are definitely NOT 3/8" NPT thread.