I have a late model qjet, I also have a Cagle. I'd really like to use the two together, but the Cagle is a 1.5psi min pressure and the qjet cuts 1psi off at the bat. Is there any way to mod the carb to defeat that particular charm so I can get the full 1.5psi? Hope someone knows!

No one I take it? Oh well, how bout a different angle. Anyone got a clue where to look for information to mod the carb not to do this? I know earlier models didnt restrict 1psi.

:question: :question: more specific details... like what are you talking about?

Okay, later model quadrajets restrict 1psi of fuel pressure somewhere in the fuel intake (so if its 6psi in the line the carb restricts it to 5psi etc). Its a problem for me because it takes the regulated 1.5psi out of the cagle and reduces it to .5psi, which means it wont idle. Im sure its a spring somewhere. I just need to know where this mechanism is and what it indeed is so that I can disable it and get the full 1.5psi.

Sorry mike, but that particular nugget of information has been thrust far from the front of my little brain - if it was ever really in there at all. I'll check some books this evening and see what I can find.

Thanks Lloyd! I appreciate it :D

That's interesting... I've had my q-jet pretty far apart, and never saw any kind of pressure restricting device. Of course, mine is not that new either...

I guess your question answered my unasked one.. I found a decent looking fuel pump, but there are 2 models... 2.5-4psi, and a 4-7psi. Guess I'll be getting the lower psi model.. I heard q-jets didn't need much pressure at all.. this confirms it..

P.S. I FINALLY took my reverse-mounted q-jet equipped cruiser out last night.. Only a road test, and it is FLAWLESS!! Gonna be getting it on some angles tonight, and going to Tellico tomorrow for some REAL testing.

I run mine with no regulator at all and it works perfect! I did send
it to THE CARB SHOP to have it modded though.

I've checked thoroughly, and can't find any evidence that Rochester ever put anyting in the fuel inlet section for the purpose of reducing pressure - up to and including the electronic feedback Qjets. However, I did turn up some things that will probably be helpful. First is that some models use a float-assist spring; and of course a spring-loaded needle and seat is exactly what a regulator is. If you have such a thing, you'll need to disable that spring. Next is that the small factory fuel filters in the inlet are notorious for creating a substantial pressure (and volume) drop, especially the sintered bronze ones. Mine was thrown away long ago, and I'd suggest one of the big Fram HPG1 units, or Summit knock-off, mounted in the line. Third is the observation (back to regulator fundamentals) that a larger inlet valve assembly will lower the seat pressure exerted by the float, and thus could help. I did see that people have run them with excellent results on 2 psi, so I see no reason why 1.5 psi should be all that different. Interesting that I found no mention of any modifications to the fuel inlet section, but there are detailed instructions for reaming the secondary fuel passages, modifying vent and pickup tubes, and literally every other part of the things. Let me know how it goes. ;)

Thanks Lloyd! I believe thats enough to get me goin! :D