Anyone have EI CGR engine instruments?

[Trippster]

I have a 1975 337G with the long range tanks. I'm putting in the EI CGR-30's and I have the total fuel, but does anyone know how many gallons are in each tank on this model? I know the Aux feeds the Mains directly, but I'm told we have 4 fuel sensors, so I need to know how many gallons are in the Aux side and how many in the main.

Thanks,

Tripp

[hayesjaj]

Originally Posted by Trippster

I have a 1975 337G with the long range tanks. I'm putting in the EI CGR-30's and I have the total fuel, but does anyone know how many gallons are in each tank on this model? I know the Aux feeds the Mains directly, but I'm told we have 4 fuel sensors, so I need to know how many gallons are in the Aux side and how many in the main.

Thanks,

Tripp

The senders for yours are essentially wired in parallel (via the conditioner box) because the tanks are plumbed together. The multiple sensors are used to determine fuel level when the wing isn’t level and the fuel moves toward one side or the other. You shouldn’t need the capacity of the aux at all. Give EI a call and they will walk you through it but only specify two tanks total for your order.

[Trippster]

Originally Posted by hayesjaj

The senders for yours are essentially wired in parallel (via the conditioner box) because the tanks are plumbed together. The multiple sensors are used to determine fuel level when the wing isn’t level and the fuel moves toward one side or the other. You shouldn’t need the capacity of the aux at all. Give EI a call and they will walk you through it but only specify two tanks total for your order.

Thanks, that makes a lot more sense to me, but I am not mechanical at all. I'll just specify the 2 tanks and I assume the wiring will tap into the conditioner box for the value. Appreciate the help

[saxbill]

Originally Posted by Trippster

Thanks, that makes a lot more sense to me, but I am not mechanical at all. I'll just specify the 2 tanks and I assume the wiring will tap into the conditioner box for the value. Appreciate the help

I spoke with EI about a similar question. On our 337D, the mains and aux are separate, so there will be separate displays for the main/aux. However, the mains actually have two tanks on each side and two senders for each side (6 senders total if you include the aux tanks). EI said that you will need a sender for each physical tank and they will provide an extra interface free of charge to combine all of the signals from each sender (so in my case for the mains) into on signal that will go to the CGR30 EDC. Given this, I'd say you would just need total usable per side.