 HOW TO: run the fuel pump for carb conversions, the easy solution! |
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| SirAndy |
  Feb 25 2005, 06:41 PM
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Resident German  Group: Admin Posts: 41,854 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California  |
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:style_emoticons/default/smash.gif) Andy (IMG:http://www.914world.com/bbs2/uploads/post-11-1109378319.jpg) (IMG:http://www.914world.com/bbs2/uploads/post-11-1109378417.jpg) |
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| porschetub |
Apr 5 2018, 07:07 PM
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Advanced Member Group: Members Posts: 4,728 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
I had to do that "hack" because the correct feed had no power even after trying several relays ,ennoying as I cleaned up the board and resealed the base without testing (IMG:style_emoticons/default/headbang.gif)
Ran it through an redundant relay and put inline fuse in ,have a replacement board to go in soon. I'am checking into a hidden switch to shut the pump off also have a few idea's. |
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Posts in this topic
SirAndy HOW TO: run the fuel pump for carb conversions Feb 25 2005, 06:41 PM
nebreitling nice one!! straight to classics!... Feb 25 2005, 06:48 PM redshift LOL
Do you have more pics? Other angles? Can a pe... Feb 25 2005, 06:51 PM MarkV Thanks, I am riunning mine off the coil.
Whats up... Feb 25 2005, 06:51 PM 914GT Hey Andy... wouldn't a good German use a brown... Feb 25 2005, 07:01 PM
rgalla9146
Hey Andy... wouldn't a good German use a brow... Apr 5 2018, 06:01 PM rhodyguy super andy. http://www.914world... Feb 25 2005, 07:10 PM SirAndy ... Feb 25 2005, 07:31 PM scott thacher heres a minor twist to this system, on a 1.8 the f... Feb 25 2005, 09:13 PM 914rat I did this conversion and it didn't work.Where... Nov 3 2011, 10:54 AM McMark Third position... Nov 3 2011, 11:09 AM Elliot Cannon I powered my pump from this pin. Nov 3 2011, 12:20 PM anderssj Another "twist" to this approach . . . .... Nov 3 2011, 12:26 PM ClayPerrine
Another "twist" to this approach . . . ... Feb 7 2015, 04:28 PM Elliot Cannon
Now everyone knows to trip the switch to disable ... Feb 8 2015, 10:37 PM Steve Pratel Hmmm, anyone know how this would apply to the 912E... Feb 8 2015, 03:05 PM patssle The awesome side-effect of this is you can easily ... Feb 8 2015, 03:10 PM Steve Pratel So I've been researching how this applies to t... Aug 27 2015, 09:50 PM SKL1 Just got two of those inertia fuel cut off switche... Aug 29 2015, 09:47 PM Jonathan Livesay
HOW TO: Run the fuel pump for carb conversions
I... Apr 5 2018, 01:24 PM SirAndy I tried this on my '74 with carbs which had be... Apr 5 2018, 02:05 PM Jonathan Livesay
I tried this on my '74 with carbs which had b... Apr 5 2018, 02:47 PM SirAndy Yes sir. I even put all 4 relays and both fuses in... Apr 5 2018, 03:20 PM Jonathan Livesay
Yes sir. I even put all 4 relays and both fuses i... Apr 5 2018, 04:21 PM SirAndy Oops sorry the other tab, the "last ditch... Apr 5 2018, 04:30 PM Jonathan Livesay
Oops sorry the other tab, the "last ditch... Apr 5 2018, 08:15 PM SirAndy So if all else fails I could run off the 12V side ... Apr 5 2018, 08:20 PM Jonathan Livesay
So if all else fails I could run off the 12V side... Apr 5 2018, 09:50 PM MarkV Both relays need to be in place and working. Apr 5 2018, 02:07 PM Noonan So what's the correct fuse size for the fuel p... Apr 6 2018, 09:27 AM SirAndy
So what's the correct fuse size for the fuel ... Apr 6 2018, 10:27 AM Noonan
Oh yeah, there it is, had to zoom way in.
Thank... Apr 6 2018, 11:10 AM Mark Henry If you're like me, /6 conversion with no relay... Apr 6 2018, 11:02 AM mtndawg Hi, resurrecting a classic. I have a 1975 and the ... Apr 15 2019, 11:20 AM Pdr1787 Hi everyone,
Long story short, someone cut my mai... Jun 5 2020, 07:05 PM |
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