Rochester 4 barrel query

[ToolsnTrack]

Where is the port for the fuel return pipe? None of them size up to the hose i took off....

[rodney]

looks like it , have you changed the carb?, looks like a 8 mm outlet and you got a 6mm pipe,


ive got a spare 4 barrel of a 351 1973 mustang , needs a refurb though

[ToolsnTrack]

Nope, same carb. I have a Holley as well but want it running on the original first. Just need to know the return port.

[rodney]

have you got a electric pump? power it up and see if fuel comes out, if not and its manual then pull a lead off and turn it over and check,.

[ToolsnTrack]

There must be a safer way. No one here know Rochester carbs?

[cairyhunt]

Looks like the same carb as I've got, but I haven't even started nailing my engine back together!

It's still doing a very good impression of a 3D jigsaw puzzle at the mo, so I can't help but am very interested in the answer.

[ToolsnTrack]

Having been faffing around today, i have come to the conclusion it doesnt have a return..

How do you like 'em apples?

[ChasR]

Alistairk is the man to ask.

I would also be trying to keep the Rochester. A misunderstood, but great carb for its day.

[akku]

Is it not the port at about 5 o'clock on the top there?

Quadrajets are great carbs for street drivers. smaller primaries for economy and snappy throttle response, but larger secondaries for w.o.t. maximum fuelling.

[ToolsnTrack]

I thought that Alistair, but it's much bigger than the return hose, like all the open non-vac ports. That one is also filthy making me think it's been unused forever.

Could it be that the return is blocked off for some reason?

[akku]

It could be, IIRC its only used for "emissions purposes" to prevent venting hydrocarbons to atmosphere rather than to return fuel to the tank (you'd run a regulator and a return line from there)

I have the Fairmont's return port unconnected to anything. That said its not running right LOL

[ToolsnTrack]

Hmm. Interesting.... Also considering the Camaro wasn't running right either when I pulled her. Bogging down on what.

[jtotheb]

i don't believe it has a fuel return the inlet pipe connects to a valve in the carb which locks the flow

[ToolsnTrack]

I found the answer to this. It has no return after all.

That pipe must have been sat there from some efi days long since past.