Barely idles

Problem started this monday. While driving, truck started puttterin and eventually stalled. Had to call AAA for a tow.

Got it home, and it stared and ran like nothing ever happened. Went to work the next day and made it home.

The following day driving in to work, started putterin again, not far from home, let it sit for an hour or so and finallly made it back home.

Now it will start, idle and eventually will putter out and stall.

Changed the fuel filter, cleaned the throttle body and mass air flow sensor.

Have not checked the fuel pressure yet.

I have been having problem with the crank position sensor (stalling while driving, no putterin, just stalling). Let it sit a few minutes and would always start back up.

Any thoughts on what the problem might be - the crank sensor, fuel pump???

Truck has about 120,000 mi, original fuel pump.

Thanks

I did not check the fuel pressure with a guage, but I did depress the schrade valve pin to just get a visual.

fuel just sputtered out, no significant pressure. Also, when I turn the key on, I do not hear the pump turn on.

Checked the relay, ok.

Now I,m 98% sure its the pump.

A lot of guys on here have had bad experiences with aftermarket pumps.

Do I stick with ac-delco or is there an aftermaket brand, carter, bosch, airtex etc that is good?

AC-Delco here, no others. It's about $100 more on the first time, but 3 months later when the AC-Delco pump is running right along and the others have quit, you will see the value in it.

unless you make fuel pressure measurements this is just guessing and if you insist on not making the proper tests you will spend money and time on replacing parts with no improvement in operation....good luck with your technic...

unless you make fuel pressure measurements this is just guessing and if you insist on not making the proper tests you will spend money and time on replacing parts with no improvement in operation....good luck with your technic...

the one thing that has me covinced is that I don't hear the pump kick on when the key is turned on.

Your right, I am guessing.

the one thing that has me covinced is that I don't hear the pump kick on when the key is turned on.

Your right, I am guessing.

Just an FYI - if you're going to do the job yourself, you may want to get a new retaining ring as well. Don't assume it comes with the kit (it might/might not). In my case that ring was rusted and it got damaged when removing it. I primed the new one before installing it. Then again my 99 1500 has "rust issues". The job is pretty simple if nothing goes wrong. I (and 3 other guys) removed the bed to get at the pump from the top.

Just an FYI - if you're going to do the job yourself, you may want to get a new retaining ring as well. Don't assume it comes with the kit (it might/might not). In my case that ring was rusted and it got damaged when removing it. I primed the new one before installing it. Then again my 99 1500 has "rust issues". The job is pretty simple if nothing goes wrong. I (and 3 other guys) removed the bed to get at the pump from the top.


if tank is full of gas remove bed....other wise drop tank....if tank dropping be prepared to replace tank straps and fasteners...and don't for get that ground strap on frame rail........!!!!!!

117,000 miles. No complaints.

Replaced the fuel pump yesterday. Bought from the dealer, ac-delco part # 19153712, $391.00 + nj tax. Included a new elec harness.

I pulled the tank with help (25 gal of fuel in the tank). Yea it was heavy. Should of drained the tank first, but I'm Polish and stupid...

Anyway, changed the harness and put the new pump in, put back together and she started right up, purrs like a kitten.

Took me longer to siphon the gas out of the tank then it took to do the change out.

The best part was the tank was clean, no sediment.

I'm off to the parts store to p/u a fuel pressure guage to test.

My next move is to change out the crank position sensor, but I' afraid, very afraid....

Thanks for all the help...


I think I might reccommend pulling the bed in the future.

117,000 miles. No complaints.

Replaced the fuel pump yesterday. Bought from the dealer, ac-delco part # 19153712, $391.00 + nj tax. Included a new elec harness.

I pulled the tank with help (25 gal of fuel in the tank). Yea it was heavy. Should of drained the tank first, but I'm Polish and stupid...

Anyway, changed the harness and put the new pump in, put back together and she started right up, purrs like a kitten.

Took me longer to siphon the gas out of the tank then it took to do the change out.

The best part was the tank was clean, no sediment.

I'm off to the parts store to p/u a fuel pressure guage to test.

My next move is to change out the crank position sensor, but I' afraid, very afraid....

Thanks for all the help...


I think I might reccommend pulling the bed in the future.

this is a good posting as you have shown your technic needs improvement...I guess you like doing things the hard way,,,more challenging...but buying the pressure gauge after the job is completed that I don't understand...

You didn't say whether the new pump helped but from your post, I can only assume it didn't help. My bet would be it was the crankshaft sensor all along. Have never changed one on an engine like yours but have changed them on other engines and it really wasn't that hard to change, in comparison to dropping fuel tank and changing fuel pump, not to mention not nearly as costly. If you have been having problems with the crankshaft sensor, that would have been the first part I threw at it. You have already thrown parts at it and sounds like it didn't help. And yes, I too am wondering why you want the fuel pressure guage now after already replacing fuel pump. Change the crankshaft sensor or repair the loose connection and see if it helps.

The fuel pump solved the main problem. Bought the gauge just to check the system out.


I still have to change the cps.

The fuel pump solved the main problem. Bought the gauge just to check the system out.


I still have to change the cps.

when you replace the CPS take a resistance measurement and compare with the new one....