IT has to be my stock pump

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Snake

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Nice day so fire up the Dart for a warm up,well after having problems with my 3310-2 flooding i blamed it:banghead: so i put my 600 on it a wile back.Well It is doing the same dam thing again flooding after it is shut off,the pump must be building to much pressure blowing the needle and seat wide open when i removed the fuel line at the carb fuel gush out, but i mean big time like it was a garden hose turned on full blast.Share your thoughts.
 
what model carburetor? I've got an Edelbrock Performer, and they are known for problems with more than 6.5PSI of fuel pressure.. and some stock replacement pumps put out around 7. You may need a regulator and gauge for your pump
 
The Edelbrock Performer manual instructs to regulate the feed to 5.5 psi with no more than 6 psi. Holley's can handle upwards of 7 psi. Like Cal_gecko said, even some of the stock replacements put out 7. I was looking at the specs for various Airtex mechanical pumps the other day on RockAuto and many were 7 psi - depending on model/year. 4-5 was common from factory.
 
usually taking a small wrench or screw driver and tap on the needle and seat bolts will jar them loose...

if they been sitting for awhile especially....
 
Is your gas tank vented Snake ? Just wondering if it is holding/building up more pressure there as well.
 
what model carburetor? I've got an Edelbrock Performer, and they are known for problems with more than 6.5PSI of fuel pressure.. and some stock replacement pumps put out around 7. You may need a regulator and gauge for your pump

Mine is a holley this carb has never had this problim befor.
 
Is your gas tank vented Snake ? Just wondering if it is holding/building up more pressure there as well.

yes it is vented there is a tube that runs from the filler down the outside tube through the trunk and opens up just under the trunk floor.
 
Sorry about the silly question Snake, I have removed a gas cap on a 75 Valiant and it about blew off before I could get it un twisted, someone put a new tank in a 4 door some where in it's past and just plugged the other lines up. I think it's time for a regulator my friend :glasses7:
 
Don, if you are absolutely sure it's not crap getting in the needle and seat then a regulator would be the answer.

One other possibility would be to put a return for the fuel using that filter with the return tube built into it.
This way all the pressure would be bled off when the car shut down.

If I was thinking to put a return on it anyway, it would also solve that problem.
If I had no intention of putting a return on it, then the regulator would be the better choice.
 
Don, if you are absolutely sure it's not crap getting in the needle and seat then a regulator would be the answer.

One other possibility would be to put a return for the fuel using that filter with the return tube built into it.
This way all the pressure would be bled off when the car shut down.

If I was thinking to put a return on it anyway, it would also solve that problem.
If I had no intention of putting a return on it, then the regulator would be the better choice.
The thing is why would it being this now same pump from day 1 of my resto never did that drove it 5000 miles why would it do that? i just finish putting on a new pump no time left to try and see what happens, tomorrow hopefully,if I do this return line can you draw how to thanks.
 
I had a Holley Mechanical pump do this, it was putting out way more pressure than it was spec'd for. Replaced it with a stock department store pump and no issues since.
 
The thing is why would it being this now same pump from day 1 of my resto never did that drove it 5000 miles why would it do that? i just finish putting on a new pump no time left to try and see what happens, tomorrow hopefully,if I do this return line can you draw how to thanks.

There are a few ways to do the return, and if you end up wanting to do it I can help.
Basically it's just a second small orificed tube off of what otherwise looks like a regular fuel filter and you run a line back to the tank from that.
It lets whatever fuel the carb does'nt need flow back to the tank.

Way less vaporlock and fuel boiling possibilities, and the plus for you would be that there would be no pressure in your fuel line after the car was off.
 
There are a few ways to do the return, and if you end up wanting to do it I can help.
Basically it's just a second small orificed tube off of what otherwise looks like a regular fuel filter and you run a line back to the tank from that.
It lets whatever fuel the carb does'nt need flow back to the tank.

Way less vaporlock and fuel boiling possibilities, and the plus for you would be that there would be no pressure in your fuel line after the car was off.

THANKSSSSSSS I will keep it in my thoughts.
 
there is a pressure relief valve in the pump /that is probably stuck from sitting.cheaper to replace the pump again.
 
I had a Holley Mechanical pump do this, it was putting out way more pressure than it was spec'd for. Replaced it with a stock department store pump and no issues since.

Thats the only pump I had an issue with also and Ive run a bunch of eddy carbs. I usually use either the Carter street pump or a stock replacement
 
I just firered it up, up to temp, off and on no flooding will let it sit try again and see what,will post back.
 
I asked what your fuel pressure is reading , no reply. Why do I even bother replying?

Because i don't have a gauge and you probably say put a regular on it,but why there should no reason to do this if you read,this stock pump is 5 years old never did need one like outhers pumps do,its stock in my 40 years always had stock pumps never needed 1 so that would be a waste of time and money.
 
I would definetly change fuel filter,cause it seems you have dirt in the system which is making your needle/seat stick...causing flooding.JMO
 
I would definetly change fuel filter,cause it seems you have dirt in the system which is making your needle/seat stick...causing flooding.JMO

I have all ready done that,what are you saying there is no way that pump can deliver to much pressure?
 
I have all ready done that,what are you saying there is no way that pump can deliver to much pressure?
You said earlier that you,ve had no problem with flooding the past 5yrs,so I,m guessing dirt has stuck a needle causing flooding.If you,ve had major flooding and everything is OK now...change oil immediately before running the engine anymore.Stock fuel pump seems to be working again with no more flooding, leads me to believe DIRT in system JMO
 
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