Author Topic: Fuel Problem 86 Coachman  (Read 1261 times)

Offline cygnus1963

  • *
  • Posts: 5
  • Member since: 2018
  • I own: a Motor Home
  • Year: 1986
  • Make: Coachmen
  • Model: Classic
  • Chassis: Ford
  • Engine: 7.5L
Fuel Problem 86 Coachman
« on: January 21, 2018, 10:02 PM »

Offline Rickf1985

  • *
  • Posts: 5351
  • Member since: 2013
  • I own: a Motor Home
  • Year: 1989
  • Make: Winnebago
  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Re: Fuel Problem 86 Coachman
« Reply #1 on: January 22, 2018, 09:31 AM »
Single exhaust or dual? Single exhaust Fords had a LOT of problems with the crossover pipe collapsing internally at the Y pipe. If it has a catalytic converter that needs to be checked, your symptoms sound like a clogged exhaust. Clogged exhaust causes manifold vacuum issues and the secondaries will not open due to low air flow. If it is the crossover pipe the exhaust will sound like a turbocharged Hoover vacuum cleaner a lot of the time and the crossover area will be glowing bright red. I have seen many interior fires caused by this in cars.
Where in the NE are you?

Offline cygnus1963

  • *
  • Posts: 5
  • Member since: 2018
  • I own: a Motor Home
  • Year: 1986
  • Make: Coachmen
  • Model: Classic
  • Chassis: Ford
  • Engine: 7.5L
Re: Fuel Problem 86 Coachman
« Reply #2 on: January 22, 2018, 11:59 AM »

Offline Rickf1985

  • *
  • Posts: 5351
  • Member since: 2013
  • I own: a Motor Home
  • Year: 1989
  • Make: Winnebago
  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Re: Fuel Problem 86 Coachman
« Reply #3 on: January 23, 2018, 08:31 AM »
This may sound simple but have you changed the fuel filters? It may go through several filters before it gets all of the stuff from the tanks out of there. A laser temperature gun is the best way to check that exhaust, it should be about the same temp all the way through without cats.

Offline cygnus1963

  • *
  • Posts: 5
  • Member since: 2018
  • I own: a Motor Home
  • Year: 1986
  • Make: Coachmen
  • Model: Classic
  • Chassis: Ford
  • Engine: 7.5L
Re: Fuel Problem 86 Coachman
« Reply #4 on: January 23, 2018, 09:38 AM »

Offline Rickf1985

  • *
  • Posts: 5351
  • Member since: 2013
  • I own: a Motor Home
  • Year: 1989
  • Make: Winnebago
  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Re: Fuel Problem 86 Coachman
« Reply #5 on: January 23, 2018, 11:25 AM »
What carburetor are you running? If Holley then you could have a hanging secondary float and it could be running out of gas in the secondary. Or a piece of dirt in the needle for the secondary needle or transfer tube. Probably a good idea to rebuild the carb anyway after sitting that long.

Offline cygnus1963

  • *
  • Posts: 5
  • Member since: 2018
  • I own: a Motor Home
  • Year: 1986
  • Make: Coachmen
  • Model: Classic
  • Chassis: Ford
  • Engine: 7.5L
Re: Fuel Problem 86 Coachman
« Reply #6 on: January 23, 2018, 04:46 PM »
It is a Holley that was actually my first thought. I had it rebuilt by a local carburetor guy.

Offline Rickf1985

  • *
  • Posts: 5351
  • Member since: 2013
  • I own: a Motor Home
  • Year: 1989
  • Make: Winnebago
  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Re: Fuel Problem 86 Coachman
« Reply #7 on: January 23, 2018, 06:46 PM »
Check the float levels. If you rule out the exhaust then it definitely sounds like fuel flow. Does it happen on both tanks? If it does then that eliminates that area. Move forward of the transfer valve. Make sure you don't have a second filter hiding somewhere in the line.

Offline cygnus1963

  • *
  • Posts: 5
  • Member since: 2018
  • I own: a Motor Home
  • Year: 1986
  • Make: Coachmen
  • Model: Classic
  • Chassis: Ford
  • Engine: 7.5L
Re: Fuel Problem 86 Coachman
« Reply #8 on: January 28, 2018, 07:30 PM »

 

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