R&R Q-Jet Accelerator Pump - 1974 #7044206

[Clem Z.]

Re: R&R Q-Jet Accelerator Pump - 1974 #7044206

clem------


...as long as it doesn't have the limiter caps still on the idle screws.

there is not likely there is a Q jet in the world with the limiter caps still on unless it is in a museum.

[Terry M.]

Re: R&R Q-Jet Accelerator Pump - 1974 #7044206

there is not likely there is a Q jet in the world with the limiter caps still on unless it is in a museum.

I have seen them on carburetors (1972 , as I recall) when judging. I suspect i may not be alone in having seen Corvettes with idle screw limiter caps still installed. And there is a frequent poster here with a NOS bag of them -- or at least a photo of same.

Clem, those of us who judge more commonly deal with museum pieces than race cars.

[Clem Z.]

Re: R&R Q-Jet Accelerator Pump - 1974 #7044206

I have seen them on carburetors (1972 , as I recall) when judging. I suspect i may not be alone in having seen Corvettes with idle screw limiter caps still installed. And there is a frequent poster here with a NOS bag of them -- or at least a photo of same.

Clem, those of us who judge more commonly deal with museum pieces than race cars.

or even DRIVEN cars.

[Paul L.]

Re: R&R Q-Jet Accelerator Pump - 1974 #7044206

try opening the idle fuel/air bleed screws about a 1/2 turn each and see if the stumble goes away

I set the air/fuel screws (no caps) with a vacuum gauge last summer so they should be close. But I will try again. I have been reading that modern fuels can be hard on the old black rubber accelerator pumps. Hence my thought to go with a Viton version.

Thinking back to when this started I also changed from factory ported vacuum to manifold vacuum so I will have to re-visit that as well.

[Clem Z.]

Re: R&R Q-Jet Accelerator Pump - 1974 #7044206

I set the air/fuel screws (no caps) with a vacuum gauge last summer so they should be close. But I will try again. I have been reading that modern fuels can be hard on the old black rubber accelerator pumps. Hence my thought to go with a Viton version.

you are correct the new fuels hardened the black rubber pump cups and the viton is the way to go.

[Jack H.]

Re: R&R Q-Jet Accelerator Pump - 1974 #7044206

Frequent poster chimes in...

Yep, you'll find the factory original QJet limiters on my '71. As for that 'bag' of NOS parts, it's rather small these days and the part is a topic of discussion for the '70-72 JG manual team. To my knowlege (and both GM parts and service documentation), these were factory stock on '71-73 QJets that are NOT mentioned in either of the applicable JG books...

The PN for the QJet version of the idle limiter cap is 7042801. I'd upload pix but I can't. They're already posted in the '70-72 JG Team's chat room (private access) and the DB prevents posted picture duplication...

[Clem Z.]

Re: R&R Q-Jet Accelerator Pump - 1974 #7044206

Frequent poster chimes in...

Yep, you'll find the factory original QJet limiters on my '71. As for that 'bag' of NOS parts, it's rather small these days and the part is a topic of discussion for the '70-72 JG manual team. To my knowlege (and both GM parts and service documentation), these were factory stock on '71-73 QJets that are NOT mentioned in either of the applicable JG books...

The PN for the QJet version of the idle limiter cap is 7042801. I'd upload pix but I can't. They're already posted in the '70-72 JG Team's chat room (private access) and the DB prevents posted picture duplication...

here is a picture of the tool to remove them without damaging them

[Gerard Q.]

Re: R&R Q-Jet Accelerator Pump - 1974 #7044206

I'd upload pix but I can't. They're already posted in the '70-72 JG Team's chat room (private access) and the DB prevents posted picture duplication...

You can post them again...when you attempt posting a pic already uploaded the link to picture is presented and verbage telling you the pic is already uploaded....click on that link to the thread and picture....right click on the pic and copy the url...go back to the thread you want to post the pic in...click on insert image icon and paste the copied url.

[Paul L.]

Re: R&R Q-Jet Accelerator Pump - 1974 #7044206

I always have a Plan B. This is it in the basement. Yes, aside from the colour (my NOM motor is black) everything there is correct 1974. That is a #7044206 carb (Carter mind you) for a 1974 truck appication. It may work, I do not know. I may just change things out and see what happens.

I wish the temps would go above 40*F so I could get on this issue. I want to drive in early May.