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Old 04-14-2013, 11:11 AM
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Q-Jet and Carter P60504 question

Does anyone know if the Carter P60504 electric fuel pump have a built in check valve? The instructions that come with it does not say. Nor does it say if the filter that came with it has one either.

Reason why I'm asking is because I've run up against the dreaded issue of my carb and lines running dry after sitting for a day or so, (IT IS NOT THE WELL PLUGS. Also, lets forget the stock check valve on the Q-jet filter....I know that's not the problem).

Takes a little longer for the fuel to get up to the carb with additional cranking, but once the fuel reaches the bowl it's consistently full from then on. Prior to this I ran the stock mechanical pump and I never had this problem, (I've always had an additional see-thru filter and one can always see fuel in the lines but not anymore after it sits for a day).

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Old 04-14-2013, 03:33 PM
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There is no one way check that I am aware of, but not really familiar with that pump.

If you fill the bowl and it drains bone dry in a day, find the leak. That much should be a visible dribble.

If it drains in 2 weeks or more, that is normal.

How is the return set up?

if you have retrofitted to electric, bump the pump on a manual momentary override button. Then you will not be cranking to fill the carb.

The bowl should remain full. If the float drops below the set point, the needle opens off the seat, and it fills again.

Your right, I never liked those see through filters either. Many ways to check for fuel at the carb, push down on the accelerator pump for instance.

Last edited by spinn; 04-14-2013 at 03:42 PM.
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Old 04-14-2013, 04:19 PM
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If you know for a fact the main wells are not leaking then you have a leaking seat where the needle rides. To check this all you have to do is shut it down, yank the fuel line off, if it continues to dribble fuel out for the next 20 or so minutes you found the problem. The seat has a metal gasket on the bottom of it and sometimes it doesn't seal as well as it should so it causes just enough fuel to leak by to drain back out at shut down.
However, if you have the main wells epoxied on your Quadrajet in every case I ever seen this doesn't stop them from leaking. All I do to make it stop is repeen them with a hammer, place the carb over a bucket, fill the bowl with fuel and let it sit in a shady spot then check on it after some hours to check the results. I've successfully done about 10 Quadrajets this way now.
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Old 04-14-2013, 06:01 PM
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Originally Posted by DoubleVision View Post
However, if you have the main wells epoxied on your Quadrajet in every case I ever seen this doesn't stop them from leaking. All I do to make it stop is repeen them with a hammer, place the carb over a bucket, fill the bowl with fuel and let it sit in a shady spot then check on it after some hours to check the results. I've successfully done about 10 Quadrajets this way now.
Done about 10 myself too. What I do is thread the wells. Dip the new hex plugs in epoxy. Then tighten them on. Always test them with high pressure air. Filling the bowl and sitting it atop a bucket is not enough because the zinc is not being exposed to a real situation of warm and cold operation.

None-the-less there's always enough fuel for about two squirts which will start the car for a few seconds. But it wont stay on long enough to flow fuel and fill the bowl up. (I checked in every-way and them plugs won't leak). I do know a little something about epoxy and most don't hold up well to heat. But not to make this too long, I figured a way around that.

What I'm trying to do is maintain fuel in the line, (reason for an inline check-valve), which will fill the bowl quicker. I'm thinking that the fuel drains all the way back to the tank. There's enough back pressure in the tank to suck the fuel back because the EVAP system works very well.
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Old 04-20-2013, 09:03 PM
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McMaster-Carr has inline check valves that work well in the fuel system.

Gary Kosier
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Old 04-21-2013, 05:06 AM
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Originally Posted by Gary Kosier View Post
McMaster-Carr has inline check valves that work well in the fuel system.

Gary Kosier
McMaster-Carr
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Old 04-21-2013, 06:07 AM
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Quote:
Originally Posted by Gary Kosier View Post
McMaster-Carr has inline check valves that work well in the fuel system.

Gary Kosier
ARRR! Got your response too late. I bought an inline check-valve kit:
SUR&R Auto Parts (SRRCKV7) Fuel Line Check Valve for 3/8" Lines : Amazon.com : Automotive SUR&R Auto Parts (SRRCKV7) Fuel Line Check Valve for 3/8" Lines : Amazon.com : Automotive
This looks like the same check valve with all the parts one needs to complete the job, (only way more expensive). I hate spending money needlessly. I knew that valve was somewhere out there without having to buy this needless kit.
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Old 04-21-2013, 11:23 AM
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Cant edit my earlier post. That pic on the Amazon site is wrong. Here's the actual pic:
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Last edited by Black Buick; 04-21-2013 at 11:29 AM.
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