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Rochester carb not squirting #1314009 Tue Jun 11 2019 10:25 PM
Joined: Jun 2019
Posts: 33
T
treydrummer Offline OP
Wrench Fetcher
So this is my first post. I've had my1950 3100 with a 6v 216 for 3 years.

In that time I've done plenty of work on it but it's been running and driving the whole time.

So 2 months ago it stalled on me after driving for about 30 minutes. Had never done that before. It was flooded. I ran the battery dead trying to get it started. The next day, on a full battery, it started right up and ran fine for a short drive around the neighborhood. Got home and parked it. Hasn't ran since.

Figured it was still flooding so since I was gonna open up the carb to check the float I figured I'd rebuild it.

I ordered a rebuild kit from mikes carbs, followed every online video I can find.

I found the check ball and spring next to power piston jammed into the power plug ( had the wrong size ball in there) also the air-fuel mix screw was chewed up like someone really cranked down on it. Ordered and replaced those parts and have fiddled with this thing for weeks but can't get a jet of fuel into the manifold.

The acc pump is doing its thing and pumping fuel past the check ball under the "T" but when I put it al together I get nothing.

Any help is greatly appreciated.

Re: Rochester carb not squirting [Re: treydrummer] #1314020 Wed Jun 12 2019 12:11 AM
Joined: Feb 2004
Posts: 19,155
H
Hotrod Lincoln Offline
Boltergeist
Check to be sure you've got the right gaskets- - - -it sounds like you've got a gasket blocking an accelerator pump passageway.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Rochester carb not squirting [Re: treydrummer] #1314062 Wed Jun 12 2019 08:54 AM
Joined: Jun 2019
Posts: 33
T
treydrummer Offline OP
Wrench Fetcher
Will do. Thanks

Re: Rochester carb not squirting [Re: treydrummer] #1314063 Wed Jun 12 2019 10:39 AM
Joined: Mar 2002
Posts: 8,903
truckernix Offline
Master Gabster
My Rochester that I have been using for years on my truck, is missing the nozzle for the spray in the throat. It works just fine but you can't see a mist or spray when moving the accelerator.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: Rochester carb not squirting [Re: treydrummer] #1314104 Wed Jun 12 2019 05:50 PM
Joined: Oct 2017
Posts: 211
L
Lindsey Offline
Shop Shark
In my limited experience after rebuilding our carb for similar reasons, it's either the check balls are not correct or missing, the plunger is not sealing or stuck (are the plunger springs correct?), or possibly the top hat of the carb is warped too much and not sealing.


1953 Canadian GMC 9314 w/ (factory) Chevy 235
Re: Rochester carb not squirting [Re: Lindsey] #1314106 Wed Jun 12 2019 06:00 PM
Joined: Jun 2019
Posts: 33
T
treydrummer Offline OP
Wrench Fetcher
I put the larger steel check ball under the "T" on the Acc Pump discharge, the smaller with the power piston behind the power plug and spring. The acc pump seems to be doing its thing but i can't speak to whether the carb body is warped. That's on the list to check.

Re: Rochester carb not squirting [Re: treydrummer] #1314183 Thu Jun 13 2019 10:55 AM
Joined: Jun 2019
Posts: 33
T
treydrummer Offline OP
Wrench Fetcher
So i found my problem with my carb. The jet off of the acc pump discharge was blocked. Someone had installed the "T" that holds the check ball and spring in a fashion that blocked the jet. I had to run a small 1/16 drill bit in to remove some the material and then used a tip cleaner for a cutting torch to push through the jet hole and open it back up. She pumps fuel like intended now.

Of all the videos and step by steps I've watched, i haven't seen anyone note that jet. The cut away diagram is what finally turned me onto the problem.

Thanks for all your guys' advice.

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Re: Rochester carb not squirting [Re: treydrummer] #1314564 Mon Jun 17 2019 01:08 AM
Joined: Jun 2019
Posts: 1
C
carolina chevy Offline
Moderated
Thank you Treydrummer. I rebuilt a Rochester yesterday that had been sitting for a few years. I cleaned it well twice and still couldn't get it to pump. After seeing your post I opened it back up again and sure enough, the tee was turned the wrong way and had a little metal blocking the passage. I opened it up and viola it started pumping. Got to hear it run for the first time this evening.

Re: Rochester carb not squirting [Re: treydrummer] #1314618 Mon Jun 17 2019 02:23 PM
Joined: Jun 2019
Posts: 33
T
treydrummer Offline OP
Wrench Fetcher
Happy to hear the thread was able to help you out.

Re: Rochester carb not squirting [Re: treydrummer] #1317554 Sat Jul 13 2019 02:07 AM
Joined: Jun 2019
Posts: 16
1
1955oneton Offline
New Guy
I have been struggling to figure out for months what's going on with my truck and after reading your OP, it was my problem down to a tee! I followed your instructions exactly as noted and just got back from a 30 mile drive, trouble free! I cannot even begin to thank you enough for sharing your trouble and solution, it's finally allowed me to enjoy my truck again with confidence!

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