 Fuel pump wiring in a 6 conversion - non relay board, Is a relay needed? |
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| nditiz1 |
 Sep 8 2021, 01:12 PM
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#1
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Senior Member  Group: Members Posts: 1,202 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region 
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So I'm not using a relay board in my 6 conversion. I have cut the 14 point harness where it branches to the trunk, so maybe just 2 ft off the end. I left the starter wire the full length. In hindsight I should have left the tach and idiot light wires just as long, but it's OK, enough to butt splice. Anyway, there are 2 red wires(switched 12 volts) I was planning on 1 for the ECU and have the other kick on the fuel pump. Is there any reason I need to run a relay for the fuel pump?
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| Spoke |
Sep 9 2021, 08:12 PM
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Jerry Group: Members Posts: 7,051 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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QUOTE(nditiz1 @ Sep 8 2021, 03:12 PM)  I was planning on 1 for the ECU and have the other kick on the fuel pump. Is there any reason I need to run a relay for the fuel pump? Will the ECU turn on/off the fuel pump like the OEM ECU does? It's usually not good to have the fuel pump come on with the ignition since if in an accident or a fuel line ruptures the fuel pump will continue to operate. |
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| mepstein |
Sep 10 2021, 05:22 AM
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914-6 GT in waiting Group: Members Posts: 19,504 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(Spoke @ Sep 9 2021, 10:12 PM) QUOTE(nditiz1 @ Sep 8 2021, 03:12 PM) I was planning on 1 for the ECU and have the other kick on the fuel pump. Is there any reason I need to run a relay for the fuel pump? Will the ECU turn on/off the fuel pump like the OEM ECU does? It's usually not good to have the fuel pump come on with the ignition since if in an accident or a fuel line ruptures the fuel pump will continue to operate. That happened to a member here on a freshly done six conversion. Engine caught fire, fuel pump continued to run. |
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Posts in this topic
nditiz1 Fuel pump wiring in a 6 conversion - non relay board Sep 8 2021, 01:12 PM
Steve The ignition switch is pretty wimpy and Porsche al... Sep 8 2021, 02:26 PM Dustin The relay is there to prevent the current that the... Sep 8 2021, 02:43 PM ClayPerrine Put the fuel pump up front.
Put a relay in above ... Sep 8 2021, 02:47 PM
Steve
Put the fuel pump up front.
Put a relay in above... Sep 9 2021, 07:07 AM IronHillRestorations +1 on Clay’s advice. Fuel pumps do better pushin... Sep 9 2021, 10:29 AM SirAndy I have cut the 14 point harness where it branches ... Sep 9 2021, 11:10 AM nditiz1
[quote name='nditiz1' post='2943915' date='Sep 8 ... Sep 9 2021, 12:50 PM nditiz1 It does not, I think I can tell microsquirt to do ... Sep 10 2021, 05:38 AM ClayPerrine If you are running Megasquirt, put the relay board... Sep 10 2021, 05:40 AM nditiz1 Thanks Clay. Very helpful, more than the one from... Sep 10 2021, 06:28 AM VaccaRabite For my Microsquirt the fuel pump works exactly lik... Sep 10 2021, 08:13 AM nditiz1 Ok wired it up on my test stand through the micros... Sep 10 2021, 10:07 AM |
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