Qjet question
Thread Starter
Intermediate
Joined: Mar 2004
Posts: 46
Likes: 0
From: kalamazoo MI
Qjet question
Aright, guys I have a quick question.
After a long cool down (more than a day), it takes awhile to get the engine fired. I looked at the accelerator pump, and I get 2 pumps before the bowl is dry. Is that normal or do I need to re-epoxy the machine ports in the bottom.
Thanks for the responses. It always surprises me, the wealth of knowledge on this forum
After a long cool down (more than a day), it takes awhile to get the engine fired. I looked at the accelerator pump, and I get 2 pumps before the bowl is dry. Is that normal or do I need to re-epoxy the machine ports in the bottom.
Thanks for the responses. It always surprises me, the wealth of knowledge on this forum
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
Originally Posted by bradzap
Aright, guys I have a quick question.
After a long cool down (more than a day), it takes awhile to get the engine fired. I looked at the accelerator pump, and I get 2 pumps before the bowl is dry. Is that normal or do I need to re-epoxy the machine ports in the bottom.
Thanks for the responses. It always surprises me, the wealth of knowledge on this forum
After a long cool down (more than a day), it takes awhile to get the engine fired. I looked at the accelerator pump, and I get 2 pumps before the bowl is dry. Is that normal or do I need to re-epoxy the machine ports in the bottom.
Thanks for the responses. It always surprises me, the wealth of knowledge on this forum
Read Lars paper on how to repair them correctly... Lars suggests a drill/tap/plug method
Many use epoxy... with good results so it's your call.
I am still not sure if a mechanical fuel pump has a check valve or not, there was a pretty long thread about this not long ago but I dont think anybody came up with a definitave answer...
Last edited by Bob Onit; Sep 14, 2006 at 07:30 AM.
Racer
Joined: Apr 2006
Posts: 477
Likes: 43
From: Millbrae California
your problem is most likely the fuel evaporating/boiling out of the carb after the engine is shut off. some of the gasoline just sitting in a cup at room temprature would evaporate out of the cup, so add in the high temps under the hood and you can see why this happens. try opening the hood and leave it open after you shut the engine off to let the heat out and see if you still have the problem.
henry @ oles carb
henry @ oles carb
Instructor
Joined: Nov 2004
Posts: 194
Likes: 0
From: Appleton Wi.
Or you can just start it for a second or two to fill the bowl and shut it off right away, the bowl will be full with no heat soak. Then wait a day or two and see if it is still empty. I highly doubt it will evaporate that fast. Mine will sit all winter, and fire-up without a cough. Sounds like classic well plug leakage. Good luck.
TJ
TJ
Burning Brakes
Joined: Nov 2004
Posts: 1,028
Likes: 0
From: San Antonio Texas
i have the same problem with my 79 (L82). fuel bowl goes dry after sitting several hours. then must crank and pump like crazy to get it started. would leaking well plugs make the engine idle poorly on cold startup? that's the only real problem i have with my Q-Jet. thanks for any info.
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Thread Starter
Intermediate
Joined: Mar 2004
Posts: 46
Likes: 0
From: kalamazoo MI
Thanks for the info.
The carb works great and I use MUCH less fuel than my buddies with the Holleys.
I'm pulling the carb this weekend and will re epoxy the well plugs. I'll let you if that works.
The carb works great and I use MUCH less fuel than my buddies with the Holleys.
I'm pulling the carb this weekend and will re epoxy the well plugs. I'll let you if that works.
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
Originally Posted by sly vette
If you have a paper filter in the carb try going to one with a check valve in it.
That would be great
Do you have a part number?
Thanks
Pro
Joined: Nov 2004
Posts: 607
Likes: 0
From: North Alabama
Before you epoxy the well plugs you might want to replace your gas cap and see if the problem goes away...if you have a vented cap. Sounds silly but I just went through the same issue you are dealing with. I couldnt believe it, but it worked. Of course this is assuming you have your return line hooked up as well.
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
Originally Posted by SmokinBBC
Did you dump all those q-jets you were collecting?
I have rebuilt a few and either gave them to friends or sold them
I have collected a few more in their place
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
Originally Posted by Bob Onit
Check valve in a filter?
That would be great
Do you have a part number?
Thanks
That would be great
Do you have a part number?
Thanks
Sorry I do not have a part number but I have a spare filter if you would like me to send it to you.
Send me your address.
Last edited by sly vette; Sep 17, 2006 at 09:39 AM.
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
Originally Posted by sly vette
They have made them for years,Bob.
Sorry I do not have a part number but I have a spare filter if you would like me to send it to you.
Send me your address.
Sorry I do not have a part number but I have a spare filter if you would like me to send it to you.
Send me your address.
I was just trying to find a way to diagnose some of the members problems with leaking fuel back after they have been sitting for a day or so
I could swear that some older Chevrolet fuel pumps had a check valve but I guess it may not be true.
A filter with a check valve could solve this mystery.