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> HOW TO: run the fuel pump for carb conversions, the easy solution!
SirAndy
post Feb 25 2005, 08:41 PM
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back by popular demand, Sir Andy's "HOW TO" series presents:

HOW TO: run the fuel pump for carb conversions

there are numerous tech. articles out there that cover this issue.
when you switch from the stock FI to carburetors, you have to install
a low pressure carb fuel-pump.
but, since the FI fuel pump is controlled by the FI brain, removing the
brain means the wires to the fuel pump won't give you 12V ...

there are a lot of "band-aid" solutions out there, some people remove the
pump relay and add a jumper there, others even run the pump off the coil!
while all those solutions work (more or less) they all lack one thing, you're
now running the pump without a relay! (and in case of the coil, without
fuse as well)

the best (and also easiest!) solution is to trick the relayboard into believing
that the FI-Brain is still connected ...

and it's as simple as connecting one wire from the 4-prong FI connector to
ground.
you keep the stock fuel pump relay and fuse and you use the stock wires
to power the new fuel pump.
below you'll see 2 pictures showing how to attach the wire. on the pump side,
simple make 2 more extension wires with "male" connectors on one end and
plug them into the stock (roundish) plug for the stock fuel pump. no need to
hack into the original harness.

this install is clean and simple! (and cheap!)

in the pics below the thick red wired replaces the FI-Brain ...
(IMG:http://www.914club.com/bbs2/style_emoticons/default/smash.gif) Andy

(IMG:http://www.914club.com/bbs2/uploads/post-11-1109378319.jpg)

(IMG:http://www.914club.com/bbs2/uploads/post-11-1109378417.jpg)
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Nathan Breitling
post Feb 25 2005, 08:48 PM
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nice one!! straight to classics!!!

(IMG:http://www.914club.com/bbs2/style_emoticons/default/pray.gif)
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redshift
post Feb 25 2005, 08:51 PM
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LOL

Do you have more pics? Other angles? Can a person with a wire, and two crimpy ends do this in less than a minute?

Who took that picture?


M
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MarkV
post Feb 25 2005, 08:51 PM
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Thanks, I am riunning mine off the coil.

Whats up with the green wire pulled out of the harness in photo #2 ?
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914GT
post Feb 25 2005, 09:01 PM
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Hey Andy... wouldn't a good German use a brown wire? (IMG:http://www.914club.com/bbs2/style_emoticons/default/smile.gif)
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rhodyguy
post Feb 25 2005, 09:10 PM
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strange...i didn't put this picture here. usta be a 912 i s
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super andy. (IMG:http://www.914club.com/bbs2/style_emoticons/default/clap56.gif) . straight to classic. i will be changing to this method.

k
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SirAndy
post Feb 25 2005, 09:31 PM
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QUOTE (redshift @ Feb 25 2005, 04:51 PM)
Do you have more pics? Other angles?

yes ...

QUOTE
Can a person with a wire, and two crimpy ends do this in less than a minute?

yes ...

QUOTE
Who took that picture?

me, myself and i ...

QUOTE
Whats up with the green wire pulled out of the harness in photo #2 ?

the engine harness is from my old 1.8L which had the green wire for the heater blower in the engine harness. my car now has a '74 (?) main harness and the wires (green/brown) for the heater blower are spliced off the the main harness instead.
i didn't want to cut the hard plastic protection of my engine harness to remove the wire but i had to take it out of the connector as the layout of the prongs changed between '70 and '74 ...

QUOTE
wouldn't a good German use a brown wire?

yes, but i didn't have any handy besides the red one. some day, i'll change it to brown.
not on top of my list right now ...

(IMG:http://www.914club.com/bbs2/style_emoticons/default/rolleyes.gif) Andy
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scott thacher
post Feb 25 2005, 11:13 PM
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suby torque rules
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heres a minor twist to this system, on a 1.8 the fuel pump relay is in the relay pack, so no relay there. what i did is to put a realy in the fuel relay spot as a spare, and i had a short wire from the screw that hold the realy board in place with a connector on it, when ever the fuel pump was needed or the relay pack was acting funny i just pluged it in.

now on the suby harness i an using the suby fuel pump relay to ground the stock fuel pump relay out through that pin , that way the suby brain still sees the suby relay in its wiring and it does its job
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