Fuel pump ghetto help

[high mileage]

Hey there. I know this is ghetto AF but is it possible to remove the tank in a driveway? I can't seem to get the truck high enough to clear the tank and would rather not cut the floor to access it. If not, is there a good write-up on cutting the floor to access? Apologies in advance for ghetto ass question...

 

[strutaeng]

Yes, you should be able to get the tank down on your driveway. I did it on my 04 Suburban last Fall.

You'll have to use the taller jackstands. I think I also used some wood blocks on my jack to get the vehicle high enough. Guys here generally don't like to cut floorboards (I'm in that camp) so I can't comment on that...

Edit: I'm assuming that the fuel pump diagnostics have been performed, right? Nothing worse, than struggling to replace a fuel pump, cutting stuff up, spending $350 and 3 hours of your time, only to find out you have a different issue.

 

[high mileage]

Yes, you should be able to get the tank down on your driveway. I did it on my 04 Suburban last Fall.

You'll have to use the taller jackstands. I think I also used some wood blocks on my jack to get the vehicle high enough. Guys here generally don't like to cut floorboards (I'm in that camp) so I can't comment on that...

Edit: I'm assuming that the fuel pump diagnostics have been performed, right? Nothing worse, than struggling to replace a fuel pump, cutting stuff up, spending $350 and 3 hours of your time, only to find out you have a different issue.

It sometimes during a hot start cranks excessively. Hard to diagnose this intermittent issue, but the truck has 205k on it so I figured a fuel pump wasn't out of the question.

 

[Scrappycrow]

It sometimes during a hot start cranks excessively. Hard to diagnose this intermittent issue, but the truck has 205k on it so I figured a fuel pump wasn't out of the question.

Your suspicion isn't unreasonable, but you need to be monitoring fuel pressure while this is happening.

Have you tried removing the gas cap while this is occurring?

 

[Fless]

Long cranks could be a leaking purge valve or injector, or it may need a crankshaft position correlation relearn. I'd do more diagnostics before condemning the fuel pump.

Having said that, the tank can be removed in the driveway. I used 6-ton jackstands for my GMT800:

 

[high mileage]

Your suspicion isn't unreasonable, but you need to be monitoring fuel pressure while this is happening.

Have you tried removing the gas cap while this is occurring?

It happens then starts right up. Only happens every now and again. Super hard to catch. No codes, have not tried removing gas cap but it does set a large evap leak after refueling that goes away right afterwards.

 

[high mileage]

Long cranks could be a leaking purge valve or injector, or it may need a crankshaft position correlation relearn. I'd do more diagnostics before condemning the fuel pump.

Having said that, the tank can be removed in the driveway. I used 6-ton jackstands for my GMT800:

View attachment 487807

Excuse my ignorance, but is the tank in the back on your truck? It's on the driver's side on mine.

 

[Joseph Garcia]

Get yourself a mechanical pressure gauge with a hose at Harbor Freight and tape it to your windshield. This way, you will be able to monitor fuel pressure in real time. Personally, I do not think that the root cause of your issue is your fuel pump.

Do you have or have access to a quality bi-directional scanner? You should look for any stored trouble codes, as this will help point you in the correct direction for identifying the root cause of your issue.

 

[high mileage]

Get yourself a mechanical pressure gauge with a hose at Harbor Freight and tape it to your windshield. This way, you will be able to monitor fuel pressure in real time. Personally, I do not think that the root cause of your issue is your fuel pump.

Do you have or have access to a quality bi-directional scanner? You should look for any stored trouble codes, as this will help point you in the correct direction for identifying the root cause of your issue.

I have a pressure gauge and a scanner. I've only ever seen 02 sensor codes (which I repaired) and large evap leak which happens after refueling.

 

[Joseph Garcia]

I have a pressure gauge and a scanner. I've only ever seen 02 sensor codes (which I repaired) and large evap leak which happens after refueling.

What does your pressure gauge tell you in real time viewing?

Get the evap leak fixed.

 

[Fless]

It happens then starts right up. Only happens every now and again. Super hard to catch. No codes, have not tried removing gas cap but it does set a large evap leak after refueling that goes away right afterwards.

Are you turning off the ignition when refueling, or letting it run?

Excuse my ignorance, but is the tank in the back on your truck? It's on the driver's side on mine.

Yes, in that pic the tank is still installed. Here's a pic after we pulled it out:

Yours won't be exactly the same, since you're in a GMT900, but it will be similar.

 

[high mileage]

Are you turning off the ignition when refueling, or letting it run?



Yes, in that pic the tank is still installed. Here's a pic after we pulled it out:

View attachment 487838

Yours won't be exactly the same, since you're in a GMT900, but it will be similar.

I turn the ignition off during refueling. My fuel tank is on the driver's side frame.

 

[high mileage]

What does your pressure gauge tell you in real time viewing?

Get the evap leak fixed.

I'll have to test fp. Will get back. Evap leak may just be the fuel cap.

 

[rdezs]

If you're going to fire the parts cannon at it, don't start with a $300, and a couple hour labor replacement.

Spend the $30 or so and replace the purge solenoid on the intake manifold, using up about 5 minutes of labor. At your current mileage, it probably needs replaced anyway.... And worth doing as preemptive maintenance.

New air filter, check for vacuum leaks, etc. Even the mechanical fuel pressure gauge to attach to the fuel rail is not expensive.... And you'll cover the most common issues.

 

[07burban88]

could also be the vent valve under the truck by the spare. gm has problem vent valves

 

[high mileage]

If you're going to fire the parts cannon at it, don't start with a $300, and a couple hour labor replacement.

Spend the $30 or so and replace the purge solenoid on the intake manifold, using up about 5 minutes of labor. At your current mileage, it probably needs replaced anyway.... And worth doing as preemptive maintenance.

New air filter, check for vacuum leaks, etc. Even the mechanical fuel pressure gauge to attach to the fuel rail is not expensive.... And you'll cover the most common issues.

Yes thank you sir I am fixing the evap leak first then will check fp and try to get the truck to act up. Like I said, it happens very intermittently. I am putting a purge solenoid on today with a new fuel cap, the air filter has already been replaced .

 

[high mileage]

could also be the vent valve under the truck by the spare. gm has problem vent valves

Ok if it acts up again will check that next.

 

[Fless]

Did I miss what specific evap code you're getting?

Although a defective vent valve can cause evap issues and codes, it won't have anything to do with hard starts.

 

[high mileage]

Did I miss what specific evap code you're getting?

Although a defective vent valve can cause evap issues and codes, it won't have anything to do with hard starts.

It's large leak, I think 455. It has erased itself. Purge solenoid had some fuel in it, not a ton but it was there. Put a new gas cap too and will see if the code is gone. Going to monitor fp as well

 

[rdezs]

Seems to be a lot of purge valve solenoids acting up lately.... Probably due to the fact they are getting old.