Possible fuel pump failure??

[09_4WD_YUKON]

OTW to work this morning, get on the interstate and give it some gas. Downshifts, then starts to spit and sputter and buck and jump like a dumped the clutch in an old Nissan 5 speed truck. got out of it and eased backed into and seemed ok. Several times on the 20 or so mile interstate drive it spits and sputters, going up overpasses does the same thing. Seems like every time I went to give it gas it does it all over, spits and sputters and bucks and jumps. Sounds like fuel issue, possible pump going out. Any other opinions? Taking it to local dealership Tuesday morning to let them deal with it.

 

[OR VietVet]

Any CEL's? How old are ignition related parts? Best to do a fuel pressure test asap.

 

[Bill 1960]

Easy enough to confirm with either a fuel injection test pressure gauge (about $50) or a scan tool that can read live data to display fuel pressure.

It does sound like the pump.

 

[09_4WD_YUKON]

Any CEL's? How old are ignition related parts? Best to do a fuel pressure test asap.

Nope, nothing. igntion parts are stock and factory, I haven't changed anything. So, 12-13 years old.

 

[wsteele]

If you have HP Tuners, can't you take a look at live fuel pressure pretty easily?

 

[09_4WD_YUKON]

Easy enough to confirm with either a fuel injection test pressure gauge (about $50) or a scan tool that can read live data to display fuel pressure.

It does sound like the pump.

Would HP Tuners show this? I'll check it this afternoon and see if it reads fuel pressure.

 

[09_4WD_YUKON]

If you have HP Tuners, can't you take a look at live fuel pressure pretty easily?

Will try this afternoon. Didn't think about that as I haven't used it in a while.

 

[wsteele]

Will try this afternoon. Didn't think about that as I haven't used it in a while.

You should see a pretty steady 43 PSI with the engine running. Best to try and simulate the conditions that caused the stumble while monitoring the pressure. Maybe capture the trims as well.

 

[OR VietVet]

Nope, nothing. igntion parts are stock and factory, I haven't changed anything. So, 12-13 years old.

Even if you find a bad fuel pump, depending on the miles, maintenance dictates that the plugs and wires be changed, clean or replace the MAF/MAP, clean the throttle bore and if mileage is high enough, change the O2 sensors.

 

[09_4WD_YUKON]

Even if you find a bad fuel pump, depending on the miles, maintenance dictates that the plugs and wires be changed, clean or replace the MAF/MAP, clean the throttle bore and if mileage is high enough, change the O2 sensors.

Yeah, probably need to do all of that.