Eric A
Full Member
It's an obsession not an investment!
Posts: 223
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Post by Eric A on Jun 13, 2010 9:54:51 GMT -5
Hi All,
I want to change my fuel pump over to electric but I am not sure what I need. I have a Webber 2bbl, What kind of pump do I need and do I need a regulator if so what kind. and I am assuming I need a block off plate also?
Thanks,
Eric A.
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Zmud
Junior Member
Posts: 57
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Post by Zmud on Jun 13, 2010 12:43:16 GMT -5
I have a holley red fuel pump with a Holley 12-804 Fuel Pressure Regulator 1-4 psi. that I run with my kadrons and it works good. If you have a pre 1975 you will need a block off plate......I'm sure this will be wrong to one member here(MJ) so this is a suggestion.
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Post by mj on Jun 13, 2010 21:17:41 GMT -5
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Post by jspbtown on Jun 13, 2010 21:58:10 GMT -5
I would also consider some sort of wiring where you can have some safety built in...ie: wiring it through an oil pressure switch.
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Post by mj on Jun 14, 2010 8:12:49 GMT -5
I would also consider some sort of wiring where you can have some safety built in...ie: wiring it through an oil pressure switch. That's a very good idea, thank you. I went half-way and installed a kill-switch for the whole system. It is a slapper switch on the dash, left of the steering wheel. Unfortunately, that would be no good if the driver were hurt before he could hit it. What do you think of a roll-over/impact switch? www.schwartzperformance.com/userfiles/small%20-%20rollover%20switch.jpg |
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Post by jspbtown on Jun 14, 2010 11:22:19 GMT -5
I would think one of them would work fine. I don't know about them enough (ie: what type of impact, how they are wired, etc) to say for sure though.
The extra risk with a VW based car is the chance of a magnesium fire. You would hate to have raw fuel just pouring on a running case for any period of time.
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Eric A
Full Member
It's an obsession not an investment!
Posts: 223
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Post by Eric A on Jun 14, 2010 11:32:08 GMT -5
Thank you all. In my last rewire I did wire in a circuit with a dash switch for the pump. But I never thought about not being able to get to it in an accident. That is a good point.
Eric A
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Zmud
Junior Member
Posts: 57
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Post by Zmud on Jun 14, 2010 11:45:11 GMT -5
I would also consider some sort of wiring where you can have some safety built in...ie: wiring it through an oil pressure switch. if you wire it through a oil switch do you just use the ground on the switch and a hot from anywhere? I would like to know alittle more about this? |
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Post by jspbtown on Jun 14, 2010 12:28:42 GMT -5
Lots of ways to skin a car...so here is just one. Take the ever popular Bosch relay like here: www.bcae1.com/relays.htm1. Bring power to the 30 tab on the relayed from a keyed (and fused) power source. 2. Run a small jumper from the 30 tab to the 86 tab 3. Run a line from the 87a tab to supply power to your fuel pump (ground your pump too). 4. From your oil pressure switch run a line to 85 tab. Here is how this set up works: At rest (no power to the relay coil), the 30 tab and the 87a tab have continuity. However, when you turn your key on power flows to the 30 tab but not into the 87a tab yet. The relay coil (86 tab) has a positive source when you turn the key (from the 30 tab), but the coil IS receiving a neg signal from the oil sensor (engine not running....no oil pressure...it grounds). So when you turn the key, you have power to the relay, but it is going to the 87 tab (unused in this application) and therefore your fuel pump is not working. However, when you crank the motor you develop pressure quickly (watch how fast your oil pressure light goes out). As soon as you develop pressure, you lose the ground signal to the 85 tab and the relay coil de-energizes. When this happen the little contacts go from 30 & 87 continuity to 30 & 87a continuity. At that point power travels from your 30 tab, to the 87a tab, and your fuel pump starts. Now in the event of an accident and you lose oil pressure, the sender creates a ground signal to the 85 tab, energizing the relay and creating continuity from the 30 tab to the unused 87 tab and the fuel pump shuts down as its power source (the 87a tab) is no longer energized. Like I said...there are many ways to skin a cat. This is just one of them. |
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