2004 tundra fuel pump bad?

truck sat for a year probably. Tried to start it with a jump. It started, ran rough for 30 seconds and then cut off. Put a new battery in. Put some seafoam and some fresh gas. Trying to turn over but won’t catch. Before I jump to a conclusion that it’s a fuel pump, can you give me the logical order of events that I should check to save as much time and money as possible? Thank you, in advance. New poster here. Not super savvy, so you might’ve to dumb it down a bit. I’m not hearing the whirring, when turning the key to the on position. safe to assume fuel pump? Best way to replace it, please?

 

It’s safe to assume rodents, actually. That’s one place you should start looking. They like to nest on top of the tank, and under the intake, where they chew shit. Especially unused trucks. Especially if you live anywhere nice are common.

First thing to do is scan for codes. Cheap code readers are $30 on scAmazon.

Next think to do is look for rodent activity. If you have a snake cam, run it up under the intake manifold. Use a mirror to look for nesting material on the tank. Your fuel pump didn’t just magically fail.

Of course, if you have the V8 (you failed to say), then you also need to ensure you have a timing belt intact. If not, your engine may be toast. Age and lack of use will cause them to snap shortly after starting the engine, which can be a saving grace, because these are light interference engines and any notable RPM while tossing the belt will cause it.

jf you want to know if this is a fuel delivery problem - and I HIGHLY doubt the pump just up and failed suddenly, OEM pumps don’t typically do that, and slapping the shit out of the wall of the tank will almost always get you a few starts if so - go to the local auto parts store. Get some starter fluid (ether). Pop off the intake tube at the throttle body. Spray some starter fluid past the throttle body into the intake, just a 1-2 second shot. Replace the intake tube. Start the truck. If it DOES turn over, you have a fuel delivery problem. But it DOES NOT mean the pump is bad. Your crank position sensor wiring could be nicked by a belt/pulley. Your fuel resistor could be shot. A relay or EFI fuse could’ve blown. There’s a myriad of explanations which DO NOT require you to drop the tank and touch the pump! Which is the easiest way to replace the pump since you asked.

Let us know. We are here to help you get thru this.

 

Thank you, shifty. I do appreciate it.

 

Stupid question, but did you siphon out all of the old gas or just add new to old? Water is heavier than gasoline and will settle in the bottom of the tank where the fuel line draws its fuel.