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Jordan B

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How much charge is in your battery? 


What happens to your voltage if you turn on the headlights instead of the fuel pump? Assuming 2x 55w bulbs @ 12v you should get about 9amp draw. If you see the same of bigger voltage drop from the lights, its your electrical system not being up to scratch (flat or too small battery). If the 9amp from the lights is fine, but the 4amp from the fuel pump causes an issue, first check that you are actually only drawing 4amp with a clamp multimeter, then start checking for damaged wires to the fuel pump that might be shorting or grounding.

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