Very good point ! I generaly dont have much time to let the pump run because I am in an immediate stall so I just switch to rear tank quickly. But my fear was that I would loose prime and then I am in trouble. But thanks for your response .

 

Both of my tanks work correctly, so I have a question or two--

1. What size is the front and rear tank ( I know the rear one is smaller)

2. Both fuel pumps are totally separate and not running unless the switch is turned to that tank, correct?

3. How many years/miles are people generally getting out of the fuel pumps before they have to be replaced?

 

I think there are a couple of sizes for each tank - that's hard to answer without knowing if it's a short or long bed, year, etc.

Correct on the pumps only running on the selected tank.

Here again, the year of manufacture seems to have an impact on the life of the pumps. Some of them keep running, but the check valves fail and lead to all sorts of issues. Some die quickly.

 

The '87-'89 share a common frame mounted pump that runs with either tank, plus the selected in-tank pump.

 

So a my 92" short bed could potentially have different size tanks than a long bed truck?? I think the 2 fuel tank deal is kind of a stupid design, but I guess I am about 20 years too late to complain about it to the designers!

 

It's a good deal for someone who wants to be able to travel long distances without stopping for gas all the time. For 'in-town' drivers, maybe not such a big deal. It sure adds a lot of extra parts to fail.

I removed the entire front tank assembly from my truck, and just run on the rear one.