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Rochester Monojet leaking from accelerator pump

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REBUILD CARB--kit comes with new pump

Posted on Aug 29, 2010

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1) You throttle likage is incorrectly adjusted. do it
2) The caburetor accelerator pump is incorrectly adjusted
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77 malibu, 305 cid, HEI, 2 barrel rottenchester, hesitates on acceleration, sucks the gas, if you let up on the gas is catches, also in park you can step on the gas and it wants to die, once is passes...


Well, I suggest that you do consider pulling the intake manifold. the plugged passageway serves another purpose: to heat the intake manifold, and that helps the fuel vaporize. This job is ugly, but necessary.clean the passageways in the heads also.

Your main complaint, however, sounds likd an accelerator pump issue. When you press the trhottle, a dual squirt of fuel is to be discharged into the venturi of the carb. This little squirt is to feed fuel until air flow increases and fuel is pulled through the off idle circuit and the main circuits. Typically, you just need to rebuild your carb. A trick is to be certain that the inlet and output check valves are sealing, I usually use the old ball bearing (steel ball) and tap it in it's seat, then discard that bearing and install the new one. Usually the pump fails, but if the checkballs leak, you get fuel on 2nd press and not the first press of the throttle. You need it on each and every press....
Most people dislike rochester because they are complicated, but you can dial out most any problem, as they are so complicated, although the 2 bbl is tons simpler than the quadrajet.

My thought is the accelerator pump circuit...Observe it closely.

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Could some one tell us how the excelerator pump linkage on the float bowl side hooks up to the engine, that's a carburator for a 1968 chevy step van. the carburator is a rochester monjet # 7040021

Looking at an exploded view of your carburator in my Chilton book it would appear to me that the accelerator pump hooks to the throttle linkage on the opposite side from the throttle cable. On that end it shows a small plate that screws into the throttle shaft. This plate has 2 links attached to it, one of which should line up with a hole in the side of the main body. You will probably have to push the pump down by hand to line up the hole in the bottom of the pump arm with the hole in the body and attach the linkage.
There is no specific info in the book regarding this, just the diagram. Hope this helps.

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You need to pressure test the system, and observe for leaks at that time, if a hose or valve CAREFULLY CUT hoses form the heater core, it will be fragile and any flexing typically breakes the core..

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I have a 1982 Oldsmobile 4door Cutlass it has a 3.8 liter V-6 with a 2 bbl carb....the car is idling OK but when you step on the throttle it starts to run rough and very keep it moving you have...


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1992 jeep wrangler with faulty acceleration. It

It is possibly the O2 sensor. I had some issues with early 90's 4.0 liters where the O2 sensor would stick rich under heavy acceleration and would cause it to lean out and bog down. It felt like a rochester four barrel flat spot on an old chevy. I hope this helps.

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Accelerator pump problem

I would change gas brands, it may be an additive they use, have seen this before on my own car, a 1973 NOVA, I went to a carb shop they sold me a Viton rubber pump, changed gas brands installed the pump and problem went away.

Sep 10, 2008 | 1983 Plymouth Gran Fury

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