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Eagle problem or just my bus?

This is a public forum to discuss Eagle related technical issues. If you are having a problem with your Eagle, this is the place to find help.
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Eagle obsessed
Posts: 322
Joined: Thu Jun 14, 2018 11:37 am
Bus Model: 1968 model 05 Eagle series 60 and B500
Location: McCook NE

Eagle problem or just my bus?

Post by Eagle obsessed »

I don’t know if this is a generic Eagle thing or just my bus, but when fueling we have to just meter it in both sides. Like just trickle the fuel in or else it backs up. I have kept fuel system close to how we got it, 3/8” vents on every tank. I’m thinking about going with bigger vents? Like 1 inch or so. Don’t know what else to do...
1968 05 Series 60/B500 swap 2019-2021
1971 05 8v71 Spicer 4 speed parts bus
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DoubleEagle
Club Member
Club Member
Posts: 280
Joined: Wed Feb 14, 2018 9:26 pm
Bus Model: 1975 Model 05 Eagle
1982 Model 10 Eagle
1984 Model 10 Eagle
1994 Model 15-45 Eagle
Location: Dayton, Ohio

Re: Eagle problem or just my bus?

Post by DoubleEagle »

There is always a chance that previous owners changed things, but at least on my 1975 Model 05, there is a large connecting hose between the two tanks (2-3") that equalizes the two levels. The parts manuals indicate that on up to 1972 models the connecting hose is 7/16", which is probably what you have. I don't know what year exactly they changed to the larger connecting hose, but one problem with that arrangement is that one tank can cause the other tank to overflow if the bus is parked on a slant. The single tank on Model 10's can do the same thing with the fills on both sides.
Walter
Dayton, Ohio
1975 Silvereagle Model 05, 8V71, 4 speed Spicer
1982 Eagle Model 10, 6V92, 5 speed Spicer
1984 Eagle Model 10, 6V92 w/Jacobs, Allison HT740
1994 Eagle Model 15-45, Series 60 w/Jacobs, Allison HT746
Eagle obsessed
Posts: 322
Joined: Thu Jun 14, 2018 11:37 am
Bus Model: 1968 model 05 Eagle series 60 and B500
Location: McCook NE

Re: Eagle problem or just my bus?

Post by Eagle obsessed »

Thanks for the info Walter. I only have a 1 inch connecting hose, and it is complicated because po at some point installed a semi tank in the middle. I’m thinking that there is not enough venting, and that all the displaced air is trying to come up filler neck as we fuel.

You should be able to see in this pic, in the middle there is a t and a 1 inch line goes up to tank in old ac compartment
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53F32246-0BAF-4F2D-9342-5DB12A1B0B7A.jpeg
6C19ECB6-215A-42DC-A237-29568C1193F9.jpeg
1968 05 Series 60/B500 swap 2019-2021
1971 05 8v71 Spicer 4 speed parts bus
User avatar
DoubleEagle
Club Member
Club Member
Posts: 280
Joined: Wed Feb 14, 2018 9:26 pm
Bus Model: 1975 Model 05 Eagle
1982 Model 10 Eagle
1984 Model 10 Eagle
1994 Model 15-45 Eagle
Location: Dayton, Ohio

Re: Eagle problem or just my bus?

Post by DoubleEagle »

Yep, definitely a custom situation that could be improved upon. Wouldn't it be nice if all previous owners included a diagram of modifications that were made to supplement the manuals? It would seem to me that each tank needs a separate vent that is as high as possible in relation to the tanks that are opened up fully when fueling.
Walter
Dayton, Ohio
1975 Silvereagle Model 05, 8V71, 4 speed Spicer
1982 Eagle Model 10, 6V92, 5 speed Spicer
1984 Eagle Model 10, 6V92 w/Jacobs, Allison HT740
1994 Eagle Model 15-45, Series 60 w/Jacobs, Allison HT746
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