http://corvaircenter.com/phorum/read.php?1,1045363
Posted by: oldqmguy
Date: September 20, 2019 02:37PM
The Input Line to the Fuel Pump is 5/16" and is a Flare Fitting at the Pump.
The Output Lines to the Carbs are 1/4" and Flared on both ends.
Clark's sells new fuel line kits if you are using the standard factory pump.
This is what I have on my '67 Monza. I am putting in an electric pump so I had to "invert" the lines to the carbs and make a 'new' Input line.
I hope this helps!
Dale cool smiley
Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!
The Airtex E8251 I selected delivers the correct fuel pressure and fuel volume for the Corvair engine. It is also a fuel pump designed to support marine installations in boats, and because of this the pump also does a good job of pulling fuel long distances. It can be installed near the engine compartment on the Corvair, and does not need to be close to the fuel tank. UNFORTUNATELY IT APPEARS TO HAVE BEEN DISCONTINUED AND IS GENERALLY NO LONGER AVAILABLE. So most electric pumps will require an installation close to the fuel tank. Check the installation instructions for the electric pump you are considering.
A power cutoff for for the electric fuel pump that cuts power if the engine stops for any reason is also recommended. A simple oil pressure sensing electrical switch is often suggested, but such switches are somewhat bulky and in conflict with the oil pressure instrument panel warning light switch that already occupies the connection point next to the generator or alternator. A new mounting point can be created using the "Adapt-a-Bolt" offered by Clark's Corvair Parts that modifies the oil filter mount. The cost for the safety switch plus the Adapt-a-Bolt runs about $52 - $65.
An alternative fuel pump controller is an electronic system offered by REVOLUTION ELECTRONICS. With a price of about $65, This electronic variation uses a tachometer sensor connected to the ignition coil negative terminal to monitor engine activity. If the engine stops, the electric fuel pump power is immediately cut off. The added features not found with the oil pressure switch option include a built-in power relay, a circuit breaker that takes the place of a power fuse for the fuel pump, and an initial electric fuel pump system 3-second pump priming that initializes the fuel in the fuel lines prior to starting the engine.
Where is the electric pump mounted? The original mechanical pump was very good at sucking the fuel from the distant tank though many feet of plumbing to the engine compartment. As long as the plumbing was fully intact, had no air leaks in the two short rubber hoses in the fuel path, and a clean tank with a clean fuel strainer at the tank outlet, plenty of gas would reach the mechanical pump, where it was pressurized appropriately (4 to 5 psi) and fed to the carburetor(s).Fuel Pump Controller
This universal electric fuel pump controller is designed for cars and trucks being upgraded from a mechanical fuel pump to an electric inline or in-tank fuel pump.
- Pump only runs if there is a tach signal from the ignition (Just connect to the negative side of the ignition if you don’t have a factory tach)
- Primes the pump for three seconds at initial key-on.
- Includes a 7.5 amp circuit breaker.
- Includes an internal relay.
- Includes 15 feet of 16 gauge wire to energize the fuel pump.
- One year warranty
- 30 day Money Back guarantee
Many electric fuel pump manufacturers recommend installation near the tank. These pumps do a better job of pushing the fuel long distances, and they prefer something close to a gravity feed from the tank to the electric fuel pump inlet (filtered). The correct pump must be selected, so that it provides the Rochester HV or Carter YH carburetor(s) with low pressure of 4-5 psi (the Carter YH on the turbo prefers even lower pressure). If you install this type of fuel pump at a high, distant location, such as inside the engine compartment, it may suffer from fuel starvation and might not provide enough fuel volume to the carburetors.
The electric fuel pump I selected for my Corvair was a marine type (Airtex E8251 Universal Solid State Electric Fuel Pump for Marine Applications). It is recommend for installation close to the engine, does an excellent job of pulling the fuel all the way from the tank to the engine compartment area, and provides good fuel volume (Operates at 2.5 to 4.5 P.S.I., delivers 30 G.P.H. at free flow). It is also very quiet in operation.
For an electric fuel pump, this Airtex E8251 seems to be the exception in design that works very well for the Corvair layout. It avoids having to be installed under the car, near the gas tank. It is fairly quiet in operation, and it delivers fuel pressure that is very acceptable to Corvair carburetors.
https://www.amazon.com/Airtex-E8251-Uni ... 693&sr=8-3
Make sure your electric fuel pump is installed according to the manufacturer's recommendations, in a good location, has appropriate fuel pressure for the Corvair, etc.
All electric fuel pumps should have their inlet filtered (by a fuel filter in a metal housing, for safety) to protect the pump. The power should be on only when the engine is being cranked or the engine is running. A safety power switch that senses engine oil pressure or uses a tachometer sensor at the ignition system will insure fuel cutoff if the engine is not running.
I recommend the electronic fuel pump controller. Its cost is a little higher than the oil pressure switch, but because the location for mounting the switch on the engine is already occupied by the instrument panel warning light switch, and this area is crowded next to the generator/alternator, the Adapt-a-Bolt may be needed to place the safety switch at the oil filter location. The cost of these two items is close to the electronic controller cost, and the electronic controller also offers additional features not included with the simple oil pressure switch.
Revolution Electronics Electric Fuel Pump Controller
https://www.revolutionelectronics.com/P ... _Pump.html https://www.amazon.com/Revolution-Elect ... 023&sr=8-3
OTHER OPTIONS...
Holley 12-810 Fuel Pump Safety Pressure Switch
https://www.amazon.com/Holley-12-810-El ... 335&sr=8-3
Mr. Gasket 7872 Fuel Pump Safety Switch
https://www.amazon.com/Mr-Gasket-7872-S ... 335&sr=8-9
https://ssl.corvair.com/user-cgi/catalo ... ow_page=28
Part number C7521: ADAPT-A-BOLT-STOCK FILTER* IF USING W/ OIL TEMP SENDER-NEED TO DRILL ADAPTOR DEEPER
Weight: 0 lbs 6 oz
Catalog Page(s): 28,27D(RM19)
Price: $ 26.40