Tank Selector Switch Problem??? Won't Start

[87r10shorty]

So I am using this at the fuel filter on the frame rail, correct? And I would place this after the  filter. Now for the fuel pulse I have no ideal what that is.

[87r10shorty]

any way... both fuel pumps went out at the same time? what exactly will this pressure test tell me.... i don't have the tool nor do i know anyone with it... i will order one if it is absolutely needed.

[VileZambonie]

Neither pumps energize at all in either position? Even for 2 seconds when you first cycle the key on? Did you check the fuse?

[87r10shorty]

i checked every fuse in there all good.... i don't now if i ever could hear the pumps before, can't hear them now, when i open the hood and with the help of someone i can hear the fuel pump relay click, but i can't hear the fuel pumps no 

[DnStClr]

The power -12vdc- goes into the selector valve on a pink wire and then it goes  to the left tank on a pink/white wire and to the right tank on a pink/black wire. 

[87r10shorty]

I purchased a multimeter today and hopefully I will be able to get to the bottom of this. I have never used one of these before. The directions state to place the red test lead on the positive feed and the black test lead to the negative feed. looking back in the previous post there is only one wire running to the left side tank and one wire running to the right side tank, in this case would i ground the black test lead and then touch each of the wires running to the pumps?

[VileZambonie]

Yes, hook your meter up in parallel. The black lead to a good ground the positive lead to the B+ feed to the pump. Turn the key on and it should see battery voltage for 2 seconds. Then have an assistant crank the engine, it should see B+ during cranking also.

[DnStClr]

R10shorty, are you ok with using the multimeter? When Vilezamboni says B+ voltage, he means battery positive voltage-which is 12 volts dc. So you set your multimeter on the dc scale- usually black scale- and on the 250 volts setting. That means your meter will read up to 250 volts dc. When you take your reading it should read 12volts or so.

[87r10shorty]

I have never felt more retarded in my life as i have trying to get a good read on this multimeter. My best guess is I'm getting between 4 and 4.5 volts to the right tank and still can't get a good read on the left tank

[87r10shorty]

This is a short video of me trying to start my truck... It usually starts and runs for a few seconds then cuts off. you'll hear at the end of the video i got it to stay running for 12 seconds.  Please take a look and let me know what you guys are thinking.

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[VileZambonie]

Make sure the negative lead is attached to a good ground. You need to verify the voltage to the pumps.

[DnStClr]

How's it going with your troubleshooting 87r10shorty? Did ya get a good read for 12 volts at the pumps?
Here's what happens with a tbi system -when you turn the ignition switch on, the ecm (computer) energizes the fuel pump relay (and the oil pressure switch), and the relay sends the signal to the pumps. So that's how you hear a buzzing under the truck with the ignition on and the truck not running. The pumps are energized to bring the
fuel up to pressure.

[87r10shorty]

After beating my head against the concrete for several hours, I had a friend with an AAA card offer to have my truck towed to an auto electric shop. Diagnosed that all the wiring and electronics for fuel system needed to be replaced. Total cost with labor and parts $280. Truck is running now, just needs a tune-up and just found out yesterday it won't pass smog.