Full Version: New Aftermarket Fuel Pump Issues
The old fuel pump has three inlets/outlets. I was told i could use a new aftermarket fuel pump, however the new fuel pump has and in and an out, how can i hook up the new fuel pump so that it will work with the fuel system? The engine is a 1.8L carbed. Do i have to hook up the return lines back to the fuel tank? thanks everybody.
You can just run the supply line to the carbs and block off the return line. Others have run a pressure regulator with the excess (greater than 5psi if Webers) going back into the return line.
It always seemed to me to be a good idea to keep the fuel flowing through the pump and back to keep it from heating up too much by sitting, and not having the pump feeling the different fuel loads. Probably not a real concern with these low pressures anyway.
You might also consider moving the pump to the location under the tank. Electric fuel pumps like to push fuel much more than try to suck it from far away. What type of fuel pump are you using?
It always seemed to me to be a good idea to keep the fuel flowing through the pump and back to keep it from heating up too much by sitting, and not having the pump feeling the different fuel loads. Probably not a real concern with these low pressures anyway.
You might also consider moving the pump to the location under the tank. Electric fuel pumps like to push fuel much more than try to suck it from far away. What type of fuel pump are you using?
QUOTE(turnaround89 @ Aug 25 2008, 06:19 PM) 
The old fuel pump has three inlets/outlets. I was told i could use a new aftermarket fuel pump, however the new fuel pump has and in and an out, how can i hook up the new fuel pump so that it will work with the fuel system? The engine is a 1.8L carbed. Do i have to hook up the return lines back to the fuel tank? thanks everybody.
just a thought:
why not use the o.e. fuel pump and open the o.e. fuel regulator to 3 or 4lbs (or whatever you'r running). i've never tried opening adjustment to lower fuel pressure to that point... anyone know if this is possible? the return lines benifit you by circulating the fuel, helping it keep cool.
by the way your o.e. pump has 3 fittings
1 inlet from tank
1 outlet to motor
1 outlet (tees into return line to tank)
(i believe) 75 up are have only 2 nipples
if you use an after market pump just plug the 3rd (from o.e. pump) line that tees into return hose to tank
QUOTE(turnaround89 @ Aug 25 2008, 05:19 PM)
The old fuel pump has three inlets/outlets. I was told i could use a new aftermarket fuel pump, however the new fuel pump has and in and an out, how can i hook up the new fuel pump so that it will work with the fuel system? The engine is a 1.8L carbed. Do i have to hook up the return lines back to the fuel tank? thanks everybody.
For carbs, you can simply plug the return line. Put a cap on it where it exits into the engine comp on the rear firewall.
Your new fuel pump is for a carbed engine, correct? If not, do *not* use a high pressure FI pump and regulate it down! That's a engine fire waiting to happen ...
When i had my 2056 with dual weber 44 IDFs, i ran a CB rotary fuel pump mounted in the stock location using the stock wiring to power the pump.
The rotary pumps are *much* quieter and the CB unit generates the correct amount of pressure, so no regulator is needed.
CB rotary Fuel Pump:
http://www.cbperformance.com/catalog.asp?ProductID=577
Tech article on how to use the stock wiring (and relay!) to power your carb fuel pump:
http://www.914world.com/bbs2/index.php?showtopic=25954
Andy
Or see the full Tech Article for a bit more electrical information:
Run the fuel pump for carb conversions - HOW TO
--- bill
Run the fuel pump for carb conversions - HOW TO
--- bill
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