Get information on Eagle, GMC, Prevost, MCI and other bus conversionsRV and bus conversion info since 1996.
Share Your Feedback    
       
 
  PRINT PAGE 
 
 
RV Classifieds
  2007 FOREST RIVER 3100 - $57,995
  2005 ITASCA 32T - $57,995
  1989 Winnebago Spectrum 2000 - $39,500
  2001 Carriage Cameo - $37,500
  1998 Tioga Z - $26,000
  VIEW ALL
  Search RV Classifieds  
  Classifieds Policies
  Benefits for Dealers  
  Sell Your RV  
  Dealer Signup  
 

Useful Links
 
RV Community
  Discussion Groups  
  RV Articles  
  RV FAQs  
  RV Classified Ads  
  Virtual RV Park  
  Shop at our Store  
  RV Lifestyle Books  
  Rate Your RV  
AllThingsRV.com
  MyRVGuide.com  
  RVMechanic.com  
Advertise With Us
BECOME A MEMBER
RV Resources
Best Rate RV Loans
e RV Loans
Visit Rio Rancho, NM for Winter
  RV Dealers  
  RV Manufacturers  
  RV Rentals  
  RV Glossary  
  RV Types  
  RV Ratings  
 

Vapor Lock Problem - 76 Chev 454

Home > Discussion Forum > Mechanic's Corner - Engines

Email Author email Ronald E. Cannon  Reply to Message reply to message  Post New Message post new message      search forums
hidden layer
ATTENTION: All Postings that advertise items for sale will be deleted from the Discussion Forum. You may post sale items for free in the Classifieds section. Sign up now.
All Messages in ThreadAuthorDate
Vapor Lock Problem - 76 Chev 454 Ronald E. Cannon 9-4-07  
With ambient temps at 85+ degrees or long runs, I have a severe vapor lock problem. I have changed all fuel filters (3, 1 in carb, 1 for each tank). I have added an electric fuel pump at the tank switching valve. That seemed to help slightly, but still a big problem. I am thinking that mabey eliminating the mechanical pump might help by eliminating fuel heating in the pump. The pump does not have a return line. Any Thoughts?
Thanks, Ron
Re: Vapor Lock Problem - 76 Chev 454 Michael Dipierro 9-4-07  
Hi i would try replacing the gas cap for starters and check your vent tubes on tank.make sure you use a good brand fuel filters, i change my chasis fuel filter once a year on my motorhome. do you have a carb or throttle body, your injectors maybe clogged or if you have a carb maybe you need the carb overhauled, well good luck
Re: Vapor Lock Problem - 76 Chev 454 richard knouse 10-18-07  
Interested in how you made out with your problem. Post back. Rich
Re: Vapor Lock Problem - 76 Chev 454 BUBBA THE BUS TECH 9-5-07  
Lots of back yard fixes for this problem. I am suprised that your unit does not have a return fuel pump on it because that would virtualy eliminate the problem. My 78 did. Maybe check to see if someone has put a cheap will fit on and eliminated the the return line. Hopefully you could put it back in service. Insulating the line from the tank all the way to the carb was how this was fixed in the sixties. (no I'm not that old, but one of my trucks was). Heat sheilds and air flow rerouting has worked on a few. I personaly would check to see if there was a return system from the pump and either build or repair this system first. Good Luck
Re: Vapor Lock Problem - 76 Chev 454 richard knouse 9-12-07  
RON, TRY RUNNING WITH YOUR GAS CAP LOOSE. OR WHEN YOUR ENGINE STALLS, OPEN THE CAP SLOWLY AND SEE IF IT SUCKS AIR. A TANK THAT CAN'T GET AIR WILL CAUSE VAPOR LOCK. AND THE HOTTER THE BETTER THE RUBBER WILL SEAL AT THE CAP. IF THE TANK IS NOT VENTING A OLD COLD SEAL WILL LEAK ENOUGH AIR IN TO ELIMINATE THE PROBLEM. RICH
Re: Vapor Lock Problem - 76 Chev 454 rich knouse 10-8-07  
RON,SORRY I'M SO LONG ANSWERING. PUMPS AREN'T USUALLY A HEAT SOURCE, UNLESS THE EXHAUST IS HEATING THE PUMP HOUSING. MOST OF THE OLDER ENGINES WITH VAPOR PROBLEMS HAD LINES ROUTED OVER THE EXHAUST MAN. OR THE CARB. SAT OVER IT. KEEP YOUR LINES AWAY FROM THE BLOCK AND BEFORE YOU SPEND A LOT, TRY RUNNING THE FUEL THRU A SMALL AUX.COOLER. SOME OF THE 70'S CHRYSLER PURSUIT CARS HAD COOLERS ON THE TRANS, POWER STEERING AND FUEL LINES. RICHARD
Re: Vapor Lock Problem - 76 Chev 454 Ronald E. Cannon 9-17-07  
Rich, Thanks, I'm going to try that, because that is somthing that would be very easily overlooked. In 1976 chevy did not have a return line from the pump. They didn,t offer a 454 in a K10 4X4. I built and installed mine. In order to use a mechanical fuel pump, I had to use a 1966 396 Chevelle fuel pump because it was short and used no return line. The front crossmember in 1976 did't have clearence for a normal 454 fuel pump because it was not designed for a 454, Daa! What do you think about elimating the mechanical pump, for the heat source, and going with an electric pump only, with a oil pressure switch of course?
Thanks, Ron
Required fields in red
For more info about a field, place your mouse over the More Info icon.
Subject:
Your Name:
Your Email:
Message:



Code is case-sensitive. Helps stop SPAM.
       



Visit Rio Rancho, NM
PRIVACY POLICY  |  TERMS & CONDITIONS  |  © 1996 - 2008 RV-Coach Network - All Rights Reserved  |  Web Site by ITtelligent