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  #1  
Old 01-04-2010, 06:47 PM
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Default SS/T Problems round 2

Can a moderator move this to the problems section? - Thanks


I don't get it guys. It went undercover for a while. Lately my truck started acting up again. At half tank, it bogged a few times, didn't die. Now at a quarter it is a total pain to keep running. My dad is solely convinced on it being water in the gas tank.

I've added heet's product to it and that caused it to sputter a lot but eventually ran through it


I had napa plug in their stupid hand held computer thing to my OBDII and there was no codes. The guy said IACV, I cleaned it, spotless, and cleaned my throttle body. He also told me to test it by turning the key and seeing if it moved. Oh it moved alright, had to put it back together cause it shot off.

Went unharmed for a while. Then it acted up a bit at half a tank. But dissappeared for a bit. Then now at a quarter tank it is bad. After driving/stalling for a while it seems to be fine.

I'd think that if water was in the gas tank... It would be a constant thing NOT go silent inbetween 1/2 tank and 1/4 tank then start again, though it is dying.


I've Seafoamed it as well. It has to be mechanically sound.

What the hell is wrong? Is this symptoms of water in the tank? If so, why didn't heets product work?
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Last edited by 98sst; 01-04-2010 at 07:05 PM.
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Old 01-04-2010, 06:56 PM
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my work truck had a similar problem. 07 silverado with 35000 miles on it.

Dealer came to the conclusion it was the fuel line sucking air at 1/2 tank. Mine wouldn't sputter tho, it just shut off.

They changed it out and the truck ran fine afterwards.
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Old 01-04-2010, 06:59 PM
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Hmm, alright. Yeah it will bog down to about 500 when it's not dying, then make its way up to 625 or so (where it should idle)

When it starts to die like this, it is damn near impossible to start back up unless I push the gas down and hold it. If I keep it in 1st gear and am going like 20, it will not die cause of the momentum. But if it's in 2nd - 4th it is done for. It has died at 35 in god knows what gear.

What's weird is after I drive for a bit it will be fine for the day, it varies on how long that drive will be though. Once on a 5 minute drive, it died 17 total times.

I've had the battery and alternator checked, they both were almost near perfect.
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Old 01-04-2010, 07:29 PM
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If you're suspecting a fuel problem, the thing to do would be to put a pressure gauge on the rail and drive it with the gauge visible through the windshield so you can watch the pressure when it acts up. Water is a possibility, but since water is heavier than fuel and would sink to the bottom of the tank, it should be doing it all the time.
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Old 01-04-2010, 07:33 PM
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Have you checked the fuel pump and filter as well alex? If you have to keep giving it gas, means you are choking out on fuel.
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Old 01-04-2010, 07:35 PM
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Quote:
Originally Posted by Remerson228 View Post
If you're suspecting a fuel problem, the thing to do would be to put a pressure gauge on the rail and drive it with the gauge visible through the windshield so you can watch the pressure when it acts up. Water is a possibility, but since water is heavier than fuel and would sink to the bottom of the tank, it should be doing it all the time.
Thanks, that is what I thought, however with turning and bumps and such, would it not become a mixture overtime? Take salad dressing for instance, settles into separate layers, but when shaken up, will blend for some time?

Pardon the comparison there, I hope you get what I mean.

I am not suspecting a fuel problem, my dad is. I just think that his assumption is too simple lol.
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Old 01-04-2010, 07:36 PM
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Quote:
Originally Posted by CdnoilRAM View Post
Have you checked the fuel pump and filter as well alex? If you have to keep giving it gas, means you are choking out on fuel.
Have not checked pump, and hear that we have an internal filter, not external. Not sure how it can be checked in that case. Would the pump throw the CEL?


See this is why it is confusing. If it is being choked at the time of the problem, why then will it correct itself after some driving and not choke itself? It just doesn't add up to me. I don't know how it all works, I am simply using logic.
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Old 01-04-2010, 07:38 PM
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You're right and that makes sense depending on how much water is in there. A fuel pressure and volume test would tell you a lot about the pump. You also might want to take a look at the connector going to the fuel pump module to make sure the terminals aren't pushed out, damaged, spread, melted or corroded. If you have a volt meter, check the voltage coming to the pump and the ground for continunity.
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Old 01-04-2010, 07:40 PM
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Here's a diagram to help you out if you decide to check the wiring to the pump.

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Old 01-04-2010, 07:42 PM
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Here's an overview of the fuel system on your truck and how it basically works.

FUEL DELIVERY SYSTEM - GASOLINE POWERED ENGINES

The fuel delivery system consists of:
  • the fuel pump module containing the electric fuel pump, fuel filter/fuel pressure regulator, rollover valve (certain modules), fuel gauge sending unit (fuel level sensor) and a separate fuel filter located at bottom of pump module
  • fuel tubes/lines/hoses
  • quick-connect fittings
  • fuel injector rail
  • fuel injectors
  • fuel tank
  • fuel tank filler/vent tube assembly
  • fuel tank filler tube cap
  • accelerator pedal
  • throttle cable
Fuel is returned through the fuel pump module and back into the fuel tank through the fuel filter/fuel pressure regulator. A separate fuel return line from the engine to the tank is not used with any gasoline powered engine.
The fuel tank assembly consists of: the fuel tank, fuel pump module assembly, fuel pump module locknut/gasket and rollover valve(s) (Refer to Emission Control System for rollover valve information)
A fuel filler/vent tube assembly using a pressure/vacuum fuel filler cap is used. On vehicles equipped with the California emissions package, the fuel filler tube contains a spring-loaded flap (door) located below the fuel fill cap. The flap is used as a secondary way of sealing the fuel tank if the fuel fill cap has not been properly tightened. It is part of EVAP monitor system when vehicle is equipped with a Leak Detection Pump (LDP)
Also to be considered part of the fuel system is the evaporation control system. This is designed to reduce the emission of fuel vapors into the atmosphere. The description and function of the Evaporative Control System is found in Group 25, Emission Control Systems.
Both fuel filters (at bottom of fuel pump module and within fuel pressure regulator) are designed for extended service. They do not require normal scheduled maintenance. Filters should only be replaced if a diagnostic procedure indicates to do so.
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