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1

Maintenance / Re: Fuel Pump/ Vapor lock issues

« on: March 19, 2018, 07:50:28 PM »

Thank you all for your reply's!

David,
I have a '69 SS w/ 396-325 hp that has a return line.
I think the return line was used on the 396 w/ a quadrajet carb.
Look on page 279 of your AIM
The filter with return line is really expensive.
Good Luck
Randy

I will check my manual when I get home tonight thanks for the info.  I have seen those filters on websites before I am sure I can find them again.  In order to use the return line must I use that filter or can I run the return right off the pump?

Are you sure it is not just bubbles? Your fuel pickup sock might be bad. If you blow in the fuel line to the tank you can tell.

I am about 99% sure.  It looks just like the 70 I am working on here at work as soon as the pump reaches about 120 degrees it starts, big bubbles first and then smaller until nothing but vapor.  There is a video on YouTube that shows exactly what mine are doing, I will try to post a link. You mentioned blowing in the line to check the sock, How can I tell by doing that if you don't mind sharing.

https://www.youtube.com/watch?v=cadNfSNi_Oc&t=142s

Thanks again for all your help!
David

2

Maintenance / Fuel Pump/ Vapor lock issues

« on: March 19, 2018, 12:21:05 AM »

Good evening all and Thanks for the add! I need a little help from some experts. I own a  pretty decent 1969 Camaro that I have had for about a decade. Regular "Bow Tie"with a 350 and some mods. It has been sitting for about a year so I drained all the fuel out, fresh gas and started it up.  After a bit the filter went dry and it died.  Replaced the pump with a Carquest aftermarket pump and could not stop a leak from the center of the line. Chinese junk I Imagine.  In the mean time I am working on a 1970 that I plan to sell that is having the same problem. During my research I have found that the fuel is boiling, Vapor Lock! Anyway back to my '69, it has a blocked off return line that I plan to hook up with a 3 line pump as soon as I replace all the rubber splices. That is supposed to cure the vapor lock.  My question to you is do any of you have one with a return line? I have a couple of other shells and they are all single fuel line cars. I can find nothing about '69s having a return line.  I even went through my assembly manual today and no mention of a return line. All the 3 line pumps I look at  are mighty tall and I am afraid I may have clearance problems I would appreciate any input You might have. I don't know what I am gonna do on the '70, I already installed heat sheath on the last section of fuel line next to the headers and still the same problem, runs for about 8-10 minutes and then you can watch the fuel boil in the filter and there is no return line.
Thanks in advance for any help you can give!
David