Sending unit help - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
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post #1 of 12 (permalink) Old Jan 3rd, 06, 11:33 AM Thread Starter
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Chris
 
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Sending unit help

Can someone tell me how a sending unit works and how it's supposed to be wired? I took this picture last night of what I think is my fuel sending unit. It's tapped into the fuel line, and is scortched on one side from being close to the header. The taped wire coming off the top appears to run to ground. I think there's a second wire running to the sender but the heat damage makes it hard to tell. Also, when I power on the fuel pump the sender makes a vibrating/buzzing sound. Is it supposed to? How concerned should I be about the heat damage to exterior. Any input would be greatly appreciated, and thanks!!!

Last edited by chriss69; Apr 18th, 06 at 02:50 PM.
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post #2 of 12 (permalink) Old Jan 3rd, 06, 05:47 PM
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Re: Sending unit help

Looks like an electric fuel pump. The buzzing you hear is the pump operating. That's my guess! If it is a pump, it needs to be closer to the gas tank. Pumps like to pump, not suck. Plus, the header heat can be a bad situation.

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post #3 of 12 (permalink) Old Jan 3rd, 06, 11:30 PM
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Re: Sending unit help

I can't tell what that is. What kind of car is this on?

Dave
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post #4 of 12 (permalink) Old Jan 4th, 06, 04:48 AM Thread Starter
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Re: Sending unit help

This is a 1969 SS camaro. The hose with the blue couplings is the fuel line, the smaller braided line is NOS. The sending unit (?) is resting on the passenger front wheel well. The headers can be seen on the extreme right side of the photo. This car has been restored and modified (stock interior, digital gauges, 509 BB, etc...) most everything in the engine compartment is new. This piece looks a little older though.
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post #5 of 12 (permalink) Old Jan 4th, 06, 04:49 AM Thread Starter
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Re: Sending unit help

I thought that at first too but I've got a Holley fuel pump next to the tank in the back.
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post #6 of 12 (permalink) Old Jan 4th, 06, 02:39 PM
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Re: Sending unit help

Perhaps another picture would help. Looks like a melted beer can, and I can't tell where it is in proximity to the motor.

Dave
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68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #7 of 12 (permalink) Old Jan 4th, 06, 04:14 PM
 
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Re: Sending unit help

It looks to me to be an after market fuel pressure sensor. It looks as though it is tied into the fuel line at only one point so I don't think it can be a pump as there would need to be an inlet and outlet. I would remove the sensor and find the correct treaded plug for it. Anything that could cause a short would be bad for buisiness.
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post #8 of 12 (permalink) Old Jan 4th, 06, 04:21 PM
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Re: Sending unit help

kind of looks like a oil pressure sending unit like this one from autometer.
http://www.autometer.com/cat_accesso...il.aspx?vid=24

It might be a fuel pressure unit. But get us a better pic to get some perspective on it.
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post #9 of 12 (permalink) Old Jan 4th, 06, 10:17 PM
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Re: Sending unit help

Wonder if someone used an oil pressure sending unit for a fuel pressure sending unit? Does it look like something someone added on or OEM? An oil pressure sending unit would work, but wonder what the guage it was hooked to looked like. Wonder what fuel pressure is being run in the line. Surely it has a pressure regulator.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #10 of 12 (permalink) Old Jan 5th, 06, 01:53 PM Thread Starter
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Re: Sending unit help

With some further research I think I'm getting closer on this one. I think it's a fuel sending unit (Summit P/N NRD S8424) for a NORDSKOG LED digital fuel pressure gauge (P/N M8424). A red wire runs off the top post of the unit to the gauge. A black wire is taped to the side of the sending unit and runs to ground in the engine compartment. The gauge reads around 14psi when the engine is at around 2000rmp. I'm still not sure about the "buzzing" sound it makes or how concerned I should be about the scortching. I've covered it with heat tape for now.
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post #11 of 12 (permalink) Old Jan 5th, 06, 02:25 PM
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Re: Sending unit help

Based on where it is, I doubt it got "scorched" in that location. Probably flopped over against the exhaust at some point, leading to it being secured where it is.

Eric
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post #12 of 12 (permalink) Old Jan 5th, 06, 02:58 PM Thread Starter
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Re: Sending unit help

It's about 3.5 - 4" from the header. Although the unit is heat taped now, I'm wondering if there is much of an increased risk of shorting or issues w/ fuel and maybe I should replace it?
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