Return fuel line need or not?
The other day I was covering my 77 after long drive and smelled gas near rear passenger side. Looked under car seen small puddle of fuel, dripping from frame. Using mirror seen rubber line from tank was leaking just before meeting hard line on frame.
Here is my question, should my return line be connected to system? Once apon a time previous owner unhooked and capped it. Could this cause pressure to hold in line cause it to fail, and cause rich conditions by over filing carb to point float and needle can't stop flow? Also when pressure checked pump had 13 psi. Thanks for listen T |
The piece that you need isn't that expensive. If you have a fuel leak in that part of the car that is the most common area for engine fires with C3's. Why take the risk, just replace it.
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13 psi is too much.
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13 PSI is too high. :iagree: It is caused by not having a return line to the fuel pump. I am surprised it is not flooding the carb????
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Seems like you have more than one problem there. As mentioned, 13 psi to the carb is to high, and tough on the float valve needle and seat. Should be more like 5-7 psi. Doubt a plugged return line from the pump has much to do with it, as only a small oriface fitting. Return line's a good idea though, as helps keep the fuel supply cooler, by looping some back to the tank. Really be more worried about the fuel pump 13 psi though, as that's the one sure to cause problems.
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Originally Posted by Vette5.5
(Post 1581164046)
Seems like you have more than one problem there. As mentioned, 13 psi to the carb is to high, and tough on the float valve needle and seat. Should be more like 5-7 psi. Doubt a plugged return line from the pump has much to do with it, as only a small oriface fitting. Return line's a good idea though, as helps keep the fuel supply cooler, by looping some back to the tank. Really be more worried about the fuel pump 13 psi though, as that's the one sure to cause problems.
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I run 6psi with no return in my 70 with no issues.
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Thanks everyone. It is a aftermarket pump, I also thought 13 psi seen high for a carb.
Next question, if unable to find pump with less pressure would a regulator do the trick? |
Don't know why a pressure regulator won't work. But I suppose it could cause issues with the stock type mechanical pump.
I have a electric pump and a pressure regulator on my 69 350/350 and it works well. Previous owner had some local "mechanic" install the electric pump which was feeding the mechanical pump, and things went all to hell. |
Based on "Frank's" observations, maybe redo the return line first, as good idea anyway. On rarely driven cars, I've been going rear mounted electric fuel pumps for many reasons. Mallory's 140 set up with engine mounted regulator seem's to be problem free. Still use an orfaced return line, and pressure gauge on the regulator, to keep an eye on things.
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From personal experience to much pressure can cause the carb to leak and then the cylinders star to fill up with gas and it wont turn over and or much worse.
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Originally Posted by FKING1
(Post 1581168171)
I run 6psi with no return in my 70 with no issues.
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Exellent, now does anyone have pic of how this return fuel line hooks into system? 77 gm service manual doesn't show it, neither does chiltons can't seem to find part that would "T“ into system in any of my wonderful catologs!?!
Thanks again T |
No pics handy,
From the pump, rubber hose to 1/4" metal line To pass sideof gas tank To rubber line to top of gas tank 1/4" nipple. There is no "T" Pump has separate return nipple. |
Wait a minute i'm no dummy, there is suppose to be two ports on fuel pump. Now I know why return isn't hooked up.
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3 ports
Inlet, outlet, return |
Originally Posted by noonie
(Post 1581170908)
3 ports
Inlet, outlet, return |
You can get the correct one anywhere like Autozone for around 30 bucks and it will be regulated for a max of 9 psi or less
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Originally Posted by noonie
(Post 1581171107)
You can get the correct one anywhere like Autozone for around 30 bucks and it will be regulated for a max of 9 psi or less
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Again thanks for all the info every one. I will pick up pump from auto zone tomorrow. I'll post end result once new pump and leak are fixed.
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