Weird fuel pump problem?!?

[dlopes]

Ok, here is my problem. I changed my gauge bulbs with LED's from superbrightled.com. All of a sudden, my fuel pump would not prime the carbs when I turned the key. I tested all of the LED's and they worked fine. I also put them in different sockets and had the same problem. I took out the fuel light LED and put the original bulb. The pump started working as it should. WTF? Should I use a resistor? Is the LED introducing too much resistance? This is driving me crazy!! Can anyone help me?

 

[yubamike]

An LED is a diode which is a one way valve for electricity, i.e. it lets current flow in one direction but not the other. I don't have a wiring diagram to look at to see if and how the fuel light is tied into the fuel pump circuit but it may be used to energize a circuit to turn on the fuel pump. If this is the case, you may have to stick with an incandescent bulb since it allows current flow in both directions.

 

[maleko89]

Yeah, replacing fuel lamp with LED isn't that simple. Vmaxchat.com used to have a circuit diagram for that mod but I can't find it.

 

[wildweasel_pt]

use 2 leds opposite ways in parallel... or turn that one around.

 

[one2dmax]

Easiest fix is to wire the original bulb in with the LED and just put the original bulb somewhere in the housing with the rest of the wires.

 

[dlopes]

Should I add a 5 ohm 3 watt resistor or a 12V diode in between the two light wires? Would that allow the fuel pump to get power?

 

[one2dmax]

I'm not an electrician so you'd have to figure out the resistance of the OEM bulb and simulate that with your resistor.