Results 1 to 3 of 3

Thread: Vapor lock

  1. #1
    ethies Guest

    Default Vapor lock

    I put a 570 CFM Street Avenger on the 305 in my 82 El Camino. I also switched to a Red electric fuel pump as I'd replaced 3 mechanical pumps in two years. Things have gone generall well since then, but a couple issues have come up:
    1. Vapor lock. On a hot day, or after a long drive, she won't restart. My ex-neighbor (used to build race engines) said that if I used one of the phenolic spacers I wouldn't get the heat transfer to the carb. Is this the case?
    2. I really think there's a lot of heat getting to the carb as the kickdown stud got hot enough to melt the clip off the kickdown cable. They don't sell the clip by itself, so I'm forced to buy the whole cable (not too bad $20). However, I don't want to have the same heat problem kill a new clip too.
    3. My red electric fuel pump is incredibly loud. I used the rubberized mounting, but its still much louder than my engine at idle. Can anything be done?
    Thanks.

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,058

    Default

    Quote Originally Posted by ethies View Post
    1. Vapor lock. On a hot day, or after a long drive, she won't restart. My ex-neighbor (used to build race engines) said that if I used one of the phenolic spacers I wouldn't get the heat transfer to the carb. Is this the case?
    2. I really think there's a lot of heat getting to the carb as the kickdown stud got hot enough to melt the clip off the kickdown cable. They don't sell the clip by itself, so I'm forced to buy the whole cable (not too bad $20). However, I don't want to have the same heat problem kill a new clip too.
    Yes, a one inch phenolic spacer will definitely help but it may not eliminate the vapor lock problem.
    You should find ways to reduce under-hood heat or help it escape more effectively. (engine tune, electric fan, hood vents, etc.)


    3. My red electric fuel pump is incredibly loud. I used the rubberized mounting, but its still much louder than my engine at idle. Can anything be done?
    Thanks.
    Electric fuel pumps will be louder when they're cavitating from overheated fuel, a suction/pickup problem or a voltage problem. Also ensure your fuel tank is properly vented (LINK).
    Last edited by Danny Cabral; 04-07-2010 at 10:46 AM.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3
    ethies Guest

    Default

    I think the electronic Q-Jet that I took off did a better job of avoiding vapor lock (central, smaller fuel bowl gets cooled by intake air). I'm going to try the spacer. The engine is tuned pretty well, runs smooth throughout the range and at various loads. I've thought about an electric fan before, but the price has scared me off for what I've thought the benefit might be. Maybe something to consider down the road.

    Thanks for the advice!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us