Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 13, 2025 ...

Pre release is the one I used.  I did get two keyed alike as there is more than $500 worth of fuel in the tank and in extreme conditions I would hate to find someone had siphoned my tank

The problem in not completely filling the tank is the water in the tanks air.  Condensation.  Algae grows. Emergency use needs.

No baseline to calculate fuel and gen use to gauge mpg and leaks.

Everything needs to match.  Plus I like the details....

Twisty roads driving hard and mostly a full fuel tank would smell.

A totally full tank topped off by leaning and then a Banzai charge up a long grade floored with a sealed cap had fuel pour out the tank overflow.

Had that happen twice.  Cajon and grapevine, ca.  Cajon was 15 gallons down from full. 

Both with sealed caps.

The m11 returns hot fuel back to the tank as it cools the head and ECU.

Big hot piece of iron back there. Worked fine.  Just returned HOT fuel  enough to expand and pressurize the tank and with a non vented cap overflow it

A totally full tank topped off by leaning and then a Banzai charge up a long grade floored with a sealed cap had fuel pour out the tank overflow.
Had that happen twice.  Cajon and grapevine, ca. 

Bob,

I expect your idea of a "Banzai" charge up a grade and mine are a little different. If you mean pedal to the metal up a really long grade like the Grapevine in summer, unless you watch EGTs carefully, the high EGTs are going to have a cumulative effect on the engine. I think this is one of the big reasons some Cummins have valve failures. Like the video shows, keep the EGTs down and the engine will live a very long time. I put a turbo 7.3 in an old RV and I met a guy who had 690,000 on his 6.9 Ford pulling one of those really long horse trailers when he traded it in.

This is a good view this time of year with many coaches driving in hot weather. Keep the temp to 210F and the EGTs down and you are not likely to have a problem months or years down the road. Nice to know the P.O. driving habits when purchasing a used coach.

Check the face of the exhaust valve in the video. Now, if there was a bad run of valves by the manufacturer, this could be the reason they break. The valve head is spun welded on with a different material used for the stem compared to the more heat resistant material for the valve head.

Pierce

https://www.youtube.com/watch?v=d_o85BQ-OOY

All this discussion over fuel caps... mine broke and I went to a repair shop next to the fuel station. Guy had a vw jetta gas cap and we tried it. Fit, and has worked perfectly for years.

Agree, have had pyro's on 4 coaches and 2 bus conversions. While in most cases, revs will fall enough so that transmission will downshift and raise rpms and lower egt's, have found more that once, when engine will maintain rpm's at WOT and not downshift. At lower rpms, exhaust temps will just keep rising. Several times have let it sit at 1350 f or 30 seconds or so before letting off, or downshifting. Probably not a big problem for rv's that seldom top 200000 miles, but for the million mile guy, a big consideration. Most Newells and lot of the big older trucks came with pyrometers as stock equipment.
On most ships I have worked on with 2 and 4 stroke engines, each cylinder had its own pyrometer.
A pyro will react immediately to an overload situation, where your water temps will take a while.