hood scoop
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New User
Joined: Feb 2003
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hood scoop
hey everyone,
I have a 1979 supercab with a new 460 she runs great but every once and a while when im running on the highway for a few hours she starts to vaporlock or sputter if i let it set for a while its ok a good friend of mine told me if i put a scoop on the hood to get air to the carb it would solve the problem i put an electric fuel pump that i can switch on when this happens it helps but does not solve the problem compleatley anybody out there have the same problem and if so how did you fix it and any ideas on where to get a hood scoop that doesent look too tacky
thanks for any info
paul
1979 supercab 2 w drive
1976 airstream safari travel trailor
1993 kdx 250 dirt bike
I have a 1979 supercab with a new 460 she runs great but every once and a while when im running on the highway for a few hours she starts to vaporlock or sputter if i let it set for a while its ok a good friend of mine told me if i put a scoop on the hood to get air to the carb it would solve the problem i put an electric fuel pump that i can switch on when this happens it helps but does not solve the problem compleatley anybody out there have the same problem and if so how did you fix it and any ideas on where to get a hood scoop that doesent look too tacky
thanks for any info
paul
1979 supercab 2 w drive
1976 airstream safari travel trailor
1993 kdx 250 dirt bike
More Turbo
Joined: Aug 2000
Posts: 721
Likes: 1
From: Floyd, Va
hood scoop
My 390 used to do the same thing. The electric fuel pump didnt help for me either. I put a 1" plastic carb spacer and rerouted my fuel lines. Mine could do it in the middle of winter. That was 3 years ago, and hasnt done it since.
Tony Warren
Nebraska
Tony Warren
Nebraska
Lead Driver
Joined: Nov 2000
Posts: 6,624
Likes: 342
From: Albuquerque
hood scoop
If you have a good electric pump I would bypass the mechanical pump all together. It's bolted to the engine and picks up a lot of heat. A bypass style regulator and a line back to the tank works really well but involves some work.
The scoop might help. Are you sure the engine isn't running hot? Good clutch fan? Be sure your filters and the sock in the tank are clear.
The scoop might help. Are you sure the engine isn't running hot? Good clutch fan? Be sure your filters and the sock in the tank are clear.
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Joined: Feb 2003
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hood scoop
it is usualy between 50 to 100 degrees when it happens
ok i understand the rerouting the fule lines that was next on the list but can you explain the 1 inch riser ? how does this help
when you say make sure that the sock is clear what do you mean. i have thaught of eliminating the manual pump alltogether and rerouting the fuel lines i think that the fuel is just getting too hot between the pump and the carb by the way it is a brand new edelbrock performer 650 carb the old holly did the same thing only more often
thanks for all your help everyone
i knew i could count on this forum
there is a forum just like this one
for airstream trailers that is also
a welth of information
thanks again
paul
ok i understand the rerouting the fule lines that was next on the list but can you explain the 1 inch riser ? how does this help
when you say make sure that the sock is clear what do you mean. i have thaught of eliminating the manual pump alltogether and rerouting the fuel lines i think that the fuel is just getting too hot between the pump and the carb by the way it is a brand new edelbrock performer 650 carb the old holly did the same thing only more often
thanks for all your help everyone
i knew i could count on this forum
there is a forum just like this one
for airstream trailers that is also
a welth of information
thanks again
paul
Freshman User
Joined: Nov 2002
Posts: 25
Likes: 0
From: Pasadena USA
hood scoop
I had a similar problem a couple years ago, I replaced the mechanical pump with an electric one and it worked for like 2 weeks, replaced the electric with an $89 holley mechanical pump and also added the spacer with a free flowing filter (K&N). It didnt help a bit. I removed the fuel tank and cleaned it with some acid and water, dryed it with an air hose and also cleaned the small filter at the end of the sending unit, this solve all my problems.
Senior User
Joined: Apr 2002
Posts: 482
Likes: 0
From: lake ariel usa
hood scoop
I also run a 2 inch plastic edelbrock spacer between the carb and intake. Keeping the heat away from the carb helps performance. Not sure if they still do but nascar used to use wooden spacers.
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Joe Kucinski
Lead Driver
Joined: Nov 2000
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From: Albuquerque
hood scoop
You might check the flow on the electric pump by pulling the hose off the mech. pump and having someone hold it in a coffee can while you turn on the electric. If you don't get a good flow try blowing compressed air back through the line to the tank to unblock the sock in the pickup.
Caution, take off the gas cap and have someone hold a rag over the tube so it doesn't gush gas out.
I run the wood 4 hole spacer and carb shields are also available.
Caution, take off the gas cap and have someone hold a rag over the tube so it doesn't gush gas out.
I run the wood 4 hole spacer and carb shields are also available.
hood scoop
Senior User
Joined: Dec 2002
Posts: 373
Likes: 1
From: Wallaceburg On.
hood scoop
A while back I saw a 79 with a custom installed hood scoop.
The owner had the scoop from an old charger or like mopar model molded into the hood. It was fairly low profile and it looked GREAT. He did mention however that the hood itself was insured separately from the truck so I have to assume this is an expensive option.
The owner had the scoop from an old charger or like mopar model molded into the hood. It was fairly low profile and it looked GREAT. He did mention however that the hood itself was insured separately from the truck so I have to assume this is an expensive option.
Postmaster
Joined: Apr 2000
Posts: 2,838
Likes: 6
From: SD
hood scoop
To stop vaporlock, I've covered the steel line with rubber hose - get the correct size hose and slice it down the side and cover the steel line. I've also seen some use those cloth/foil sleeves that you buy to cover sparkplug wires, worked good on a stock car... I've also seen guys adjust the rear of the hood so there is a 1" gap to let the hot air out - works...
As far as a hood scoop, I've seen pics of 73-79s with a 69 mustang 429 scoop - looks great, a reproduction scoop costs about $50 and bolts onto the hood.
Marty
As far as a hood scoop, I've seen pics of 73-79s with a 69 mustang 429 scoop - looks great, a reproduction scoop costs about $50 and bolts onto the hood.
Marty