going from FI to carbs - fuel pump question

[CHA914]

My father and I are putting a 2.0L carbed engine in his '75 1.8L 914...so I was wondering if we have to replace the EFI pump under the gas tank, or can we bypass it somehow and use an aftermarket low pressure pump. If we do have to remove the EFI pump, is there a way to get to it without removing the gas tank? Also, is there anything else we need to change in doing this conversion (eg. fuel lines etc...).

And don't worry this engine was built by a pro with carbs in mind, so it has the correct setup for carbs :P

Thanks for the help,

Tony

[racejoe]

Yes you need to swap it out for a different pump, like a facet pump (lower psi). You may be able to get at the pump from the access holes underneath, but it would be a WHOLE lot easier if you take the tank out. It really isn't too hard to take it out.



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Joe
74 Yellow 1.8L 914
72 Tangerine NoL 914
http://pages.sssnet.com/jkaull

[Dave at Pelican Parts]

In a 75, you should just be able to remove the access plate in the front trunk. The pump and filter should be mounted to that plate. Swap those out for the carb pump and filter. Then cap off the return fuel line (either under the tank, or back in the engine bay) and I think that's it.

Oh, since you won't have any FI computer, you'll have to do a bit of re-wiring to supply power to the fuel pump.

--DD

[efeinsmith]

Just be careful of you're state's Emission Police at inspection time. With some states, 1975 is old enough not to worry (I'm in GA, and that's the case here), but in others (like CA), it may cause you lots of grief.

[CHA914]

Thanks for the help guys...and not to worry about the state police, I happen to be lucky enough to live in Texas :P

Yours,

Tony

[Roland Kunz]

Helo

You can replace it by a Porsche 911 carb fuelpump.

Webers are critical on constant high fuelflow so best is to use an Porsche 901/902, facet or Pierburg carb fuelpump.

Pierburg offers an ignition triggered relay that will shut pump off after 1-3 secounds.

Just an saefty device and will help the swimmer needle from the webers.

To run the fuelpump just make an jumperwire on the relay or D-Jetronic interface.

[Dave at Pelican Parts]

Specifically, plug a 1/4" insulated female spade connector into the "I" pin on the T-4 connector on the relay board. The T-4 is the four-pin connector on the left rear of the board, pin I is the right-front pin of that connector.

That pin is fed by the "power supply relay" (2nd from the front of the board) which is controlled by the power going to the ignition coil. You get a nice relay-protected circuit to drive the pump. The wire going to the pump is the left-front wire (#13) of the T-14 (front-right on the relay board) connector. Unplug it from there, and plug it into the T-4 connector.

--DD