your help needed PLEASE quick question
Thread Starter
Intermediate
Joined: May 2012
Posts: 46
Likes: 0
From: melbourne Victoria
your help needed PLEASE quick question
Hi there
quick question
i have a 69 350/300hp and have changed the carburettor to a Holly
but will still like to run the return line back to the tank,
i ordered a 1970 fuel pump and to achieve this, but its a bigger in the bowl
my Q: is will it be ok and will i have any clearance issues with suspension etc?
also the 69 fuel pump i have on at the moment is only 1 year old and i put a pressure gauge on it and it pushed 12psi on idle and dropped to 10psi when rev
thanks Lou
quick question
i have a 69 350/300hp and have changed the carburettor to a Holly
but will still like to run the return line back to the tank,
i ordered a 1970 fuel pump and to achieve this, but its a bigger in the bowl
my Q: is will it be ok and will i have any clearance issues with suspension etc?
also the 69 fuel pump i have on at the moment is only 1 year old and i put a pressure gauge on it and it pushed 12psi on idle and dropped to 10psi when rev
thanks Lou
Melting Slicks
Joined: Jun 2005
Posts: 2,239
Likes: 74
From: Palatine, Peoples Republic of Illinois
St. Jude Donor '09-'10-'11-12-'13-'14-'15-'16-'17-‘18
NCM Sinkhole Donor
The '69's and '70's should be almost identical in that area so clearance shouldn't be a problem. As for the fuel line pressure - your Holley may not be happy with 12 psi. They usually are happy at half that. Too much pressure will force fuel through the needle valve and flood the engine.
Hope this helps.
Hope this helps.
Team Owner
Joined: Sep 2006
Posts: 31,285
Likes: 4,375
From: Westminster Maryland
Hi Lou,
I'm wondering if since the bowl is 'deeper' and the connections 'lower' you'll need to use the 'preformed' rubber gas lines to prevent the 'kink' that troubles slightly later cars with the deep bowl??
Using a straight piece of hose on the supply line puts too much curve in it and pinches off the gas supply.
Maybe?
Regards,
Alan
I'm wondering if since the bowl is 'deeper' and the connections 'lower' you'll need to use the 'preformed' rubber gas lines to prevent the 'kink' that troubles slightly later cars with the deep bowl??
Using a straight piece of hose on the supply line puts too much curve in it and pinches off the gas supply.
Maybe?
Regards,
Alan
2026 Loser of the Year
Joined: Sep 2013
Posts: 36,601
Likes: 7,048
From: New Or-leens Loo-z-anna
The '69's and '70's should be almost identical in that area so clearance shouldn't be a problem. As for the fuel line pressure - your Holley may not be happy with 12 psi. They usually are happy at half that. Too much pressure will force fuel through the needle valve and flood the engine.
Hope this helps.
Hope this helps.
version (engines used for racing) regulates pressure from 4-1/2 to 9 PSI. NOTE: These regulators are
designed to work with a single carburetor installation."
Safety Car
Joined: Jun 2013
Posts: 4,399
Likes: 793
Hi there
quick question
i have a 69 350/300hp and have changed the carburettor to a Holly
but will still like to run the return line back to the tank,
i ordered a 1970 fuel pump and to achieve this, but its a bigger in the bowl
my Q: is will it be ok and will i have any clearance issues with suspension etc?
also the 69 fuel pump i have on at the moment is only 1 year old and i put a pressure gauge on it and it pushed 12psi on idle and dropped to 10psi when rev
thanks Lou
quick question
i have a 69 350/300hp and have changed the carburettor to a Holly
but will still like to run the return line back to the tank,
i ordered a 1970 fuel pump and to achieve this, but its a bigger in the bowl
my Q: is will it be ok and will i have any clearance issues with suspension etc?
also the 69 fuel pump i have on at the moment is only 1 year old and i put a pressure gauge on it and it pushed 12psi on idle and dropped to 10psi when rev
thanks Lou
ZIO
