Trying a simple fuel pump wiring setup - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Chrisw · 01-19-2017, 02:58 PM

long story short... I tucked the wiring harness in the driver side front wheel well since it was rubbing with the new track rims. Now, when I take Right turns at speed, the chassis seems to twist just enough to short out my fuel pump. That's my best theory right now anyway.

In order to diagnose the problem 100 percent, I was going to run the following wire to see if it fixes the problem:

Battery --> Switch --> Fuse --> Fuel Pump --> Ground

Does that make sense or am I missing something? If that eliminates the problem I will rewire the car properly.

I know there are 5 wires running to the fuel tank. My understanding is that the 3 wire clip is only for the fuel guage, and the 2 wire clip is simply + and - for the pump.

Is that all right?

*dbeiler* · 01-19-2017, 06:17 PM

I'm assuming you mean the fuel pump fuse is blowing. Pull the pump out of the tank and check the wiring. The idiot who wired mine a few years ago did a terrible job. After it started blowing the pump fuse, I pulled the pump out and saw uninsulated, parallel wire splices! WTF! Replacing the splices with insulated ones fixed the issue, obviously.

Chrisw · 01-19-2017, 07:12 PM

Quote:

Originally Posted by dbeiler

I'm assuming you mean the fuel pump fuse is blowing. Pull the pump out of the tank and check the wiring. The idiot who wired mine a few years ago did a terrible job. After it started blowing the pump fuse, I pulled the pump out and saw uninsulated, parallel wire splices! WTF! Replacing the splices with insulated ones fixed the issue, obviously.

Sadly I don't.. and maybe I'm misdiagnosing it... Basically, when I'm heading into the corner, all is fine. During the corner the engine sputters and seems like it's getting no fuel... once I'm out of the corner it's back to normal. It only happens on Right turns. I think it might be pulling the wiring. Does that even make sense?

Fuse stays in good shape.

tgd89 · 01-19-2017, 08:24 PM

Full tank of gas and it'll do this?

Chrisw · 01-19-2017, 08:27 PM

Yep. It feels and sounds like fuel starve, but the tank is full. Hence why I think it is the FP cutting out.

*Nissan2nr22* · 01-20-2017, 08:00 AM

Start by taking the wheel off and sending us a lot of photos of what it looks like under there

Then we can diagnose this better

That harness does not flex unless its still rubbing on the tire when turning.

01-19-2017, 02:58 PM	#1
Chrisw Zilvia Member Join Date: Jan 2008 Location: Edmonton Age: 37 Posts: 264 Trader Rating: (2) Feedback Score: 2 reviews	Trying a simple fuel pump wiring setup long story short... I tucked the wiring harness in the driver side front wheel well since it was rubbing with the new track rims. Now, when I take Right turns at speed, the chassis seems to twist just enough to short out my fuel pump. That's my best theory right now anyway. In order to diagnose the problem 100 percent, I was going to run the following wire to see if it fixes the problem: Battery --> Switch --> Fuse --> Fuel Pump --> Ground Does that make sense or am I missing something? If that eliminates the problem I will rewire the car properly. I know there are 5 wires running to the fuel tank. My understanding is that the 3 wire clip is only for the fuel guage, and the 2 wire clip is simply + and - for the pump. Is that all right?

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01-19-2017, 06:17 PM	#2
dbeiler Premium Member Join Date: Jun 2012 Location: Lancaster county, PA Age: 30 Posts: 465 Trader Rating: (4) Feedback Score: 4 reviews	I'm assuming you mean the fuel pump fuse is blowing. Pull the pump out of the tank and check the wiring. The idiot who wired mine a few years ago did a terrible job. After it started blowing the pump fuse, I pulled the pump out and saw uninsulated, parallel wire splices! WTF! Replacing the splices with insulated ones fixed the issue, obviously.

01-19-2017, 08:24 PM	#4
tgd89 Leaky Injector Join Date: Oct 2005 Location: abq nm Posts: 123 Trader Rating: (0) Feedback Score: 0 reviews	Full tank of gas and it'll do this?

01-19-2017, 08:27 PM	#5
Chrisw Zilvia Member Join Date: Jan 2008 Location: Edmonton Age: 37 Posts: 264 Trader Rating: (2) Feedback Score: 2 reviews	Yep. It feels and sounds like fuel starve, but the tank is full. Hence why I think it is the FP cutting out.

01-20-2017, 08:00 AM	#6
Nissan2nr22 Premium Member Join Date: Aug 2008 Location: USA Posts: 1,566 Trader Rating: (30) Rides Gallery: Nissan2nr22 Feedback Score: 30 reviews	Start by taking the wheel off and sending us a lot of photos of what it looks like under there Then we can diagnose this better That harness does not flex unless its still rubbing on the tire when turning.