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Old 16th July 2017, 08:15 PM   #1001
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CESLAW
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GT40: RCR
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Re: Chuck and Ryan's RCR Build

Pump Installation

To address the noise and vibration, the pumps were mounted using rubber washers, 1 inch diameter and eighth inch thick, with matching steel washers, on both sides. Fittings compatible with the black fabric covered fuel line and vintage style clamps were used to match the carburetor plumbing. Where possible aluminum tubing was used to span longer or less accessible locations.

The aluminum tubing ends were treated with a bead tool to assure the hose and clamps would stay in place. This tool is available from several sources including Pegasus.

The fuel line goes directly from the tank to the input of the pump. No separate filter is needed, since it is integral with the pump. This eliminates another pair of connections on both sides.

An aluminum fuel line was used to carry the fuel from the right fuel pump, along the base of the firewall opening, to the regulator on the left side. It was covered with insulating material. This line was connected to the pump on the right and the regulator on the left side with lengths of 3/8” I.D. fuel line.

Clearance issues required a bit of trimming. Small sections of fiberglass had to be cut away on the inside of the rear clip to clear the top of the right pump.
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Chuck and Ryan's RCR Build-dsc_0079comp-jpg   Chuck and Ryan's RCR Build-dsc_0094comp-jpg   Chuck and Ryan's RCR Build-dsc_0118comp-jpg   Chuck and Ryan's RCR Build-dsc_0129comp-jpg  
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Old 18th July 2017, 09:13 PM   #1002
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GT40: RCR
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Re: Chuck and Ryan's RCR Build

Pressure Regulator

While researching the issue an Aeromotive regulator designed specifically for high volume low pressure applications, specifically Webers, was found. It is a bit pricey, but seemed ideal for this application.

Pegasus had one in our hands in a couple of days. It requires AN fittings with O rings. Very nice piece. Aeromotive / Pegasus part number AEI-13222.

The previous set up included a large fuel filter / water separator which had two inputs, making it a good connection point for the left and right tanks. We pitched it. The new Aeromotive regulator was mounted in the same area where that massive filter had been located before. A simple “T” connection on the input side brought fuel from both pumps to the regulator. The integral check valves in each pump will prevent fuel from one tank filling the other, eliminating the need for separate check valves and thus eliminating another pair of connections on each side.

The pressure gauge is an inexpensive unit. It is not liquid filled. (I was not aware that liquid filled gauges quickly lose their accuracy as the engine compartment heats up). Once the 2 ˝ pounds of pressure were confirmed, I removed the gauge and put a plug into the opening. Keep it simple.

The fuel flow problem has been resolved. Both tanks flow well. The noise which we noted when initially testing the pumps proved to be a non-issue. At idle one hears a “clicking” sound but underway the pumps cannot be heard over the din of the rear exhaust.

This new set up has another advantage. There are a total of eight fewer connections since the check valve and filter are integral with the pump. In addition nearly all connections are now visible and not concealed behind the two side panels. This makes the chances of leaks at connection points less likely and also makes a check of the connections possible at a glance.
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Old 18th July 2017, 11:22 PM   #1003
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GT40: Gulf Cart
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Re: Chuck and Ryan's RCR Build

Great report Chuck... Simpler is always better...
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