1976 Silverado C10 Fuel Pump needed

[optimist]

Hello everyone. My mechanic says my issue is the fuel pump that goes to the dual tanks is what is leaking, however he is having issues finding the part. Anyone know where I may be able to find this?

Thank you

 

[75gmck25]

I think he means the fuel solenoid that switches between tanks. The original one for your truck had either 3 ports (fuel pump does not have a return line) or six ports (if your fuel pump has a return line). The 3 port solenoids are still available, but the six port solenoid from 1976 was a version that only one electrical wire connected to it, and that solenoid is not longer available.

Newer six port solenoids have multiple wires, and they use a different dash switch and wiring. You can retrofit them to your truck, but you need more parts and the correct wiring.

 

[fast 99]

I think he means the fuel solenoid that switches between tanks. The original one for your truck had either 3 ports (fuel pump does not have a return line) or six ports (if your fuel pump has a return line). The 3 port solenoids are still available, but the six port solenoid from 1976 was a version that only one electrical wire connected to it, and that solenoid is not longer available.

Newer six port solenoids have multiple wires, and they use a different dash switch and wiring. You can retrofit them to your truck, but you need more parts and the correct wiring.

I have the 6 port aftermarket single valve on one truck. thought about what I would do if it failed. Might be more trouble than installing the factory set up but what about a pair of the 3 port valves with a single on off on switch?

 

[Turbo4whl]

I have the 6 port aftermarket single valve on one truck. thought about what I would do if it failed. Might be more trouble than installing the factory set up but what about a pair of the 3 port valves with a single on off on switch?

Just use one, 3 port electric valve and add a "T"

Since the OP has not been back to see any reply's, there is an easy fix. Early carb'ed trucks don't have a fuel return like fuel injected trucks. The second line to the fuel pump is just a vent. You "T" the 3 vent lines together. Add this valve bolted to the floor. Right tank on, or left tank on, or turn both tanks off.

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[75gmck25]

I you have a fuel pump with two barbed connections and one threaded connection for the steel line to the carburetor, you definitely have a fuel return line, not a vent.

It should work to use two 3 port solenoids, or maybe you just cap off the return line. The return line allows warm/hot fuel to circulate back to the tank, which cools it and helps prevent vapor lock. With no fuel return you have more risk of vapor lock, but many trucks work fine that way.

My 1975 K20 apparently has California emissions, and that included the return line. Many ‘75 trucks did not have a fuel return.

 

[optimist]

Thank you everyone for the replies. I will need to get more info from the mechanic on exactly what I need or see if he can do these other options

 

[Grit dog]

2ea single wire 3 port valves can be rigged to provide supply and return. These are cheap and readily available.
IMO if you plan on summer driving in the mountains and already are setup for a return line, keep it. Vapor lock is more prevalent at higher altitudes (and heat).
But it will run fine with a 2 port pump (no return) and a 1 wire 3 port switching valve.
As you unfortunately don’t have the ability to fix this diy, if your mechanic is not creative and understands dual tank carb setups, you may need to find someone who does.
This is old technology that hasn’t been on class 1-3 trucks for 3-4 decades now. Need someone who knows what they’re doing.

 

[optimist]

Yes, finding someone to work on a truck of this age has been tricky to say the least.

 

[Old Guy Bill]

I've not had any luck out of the common pumps available, Carter, Napa, etc..
I've tried three with a return line port, two of them the fuel pressure jumped continuously from 2-5lbs, the third was consistent at 5lbs but failed after a month.
The Edelbrock without a return has solid 5-6lbs of pressure.. but no return line. Hasn't caused me a problem...yet.