Pirate 4x4 banner

1 - 11 of 11 Posts

·
Registered
Joined
·
8 Posts
Discussion Starter #1
i have a 2001 Z71 gmc truck i was driven it down the road last night and went around a curve and it died on me i put it in neutral and it started backup for me but now it acts like it is running out of gas but it just acts this way sometimes not always and now the check engine light is on so i took it to the auto parts store and hooked it up to the machine to get the codes out of it and it said .



P0171 System Too Lean (Bank 1)

P0174 System Too Lean (Bank 2)

it said these codes 2 times and then it said

P0300 Random/Multiple
Cylinder Misfire Detected

does anyone know what could be causing this thank you for your help
 

·
Registered
Joined
·
1,447 Posts
How about your guage not reading correctly and low on fuel??

Or the baffle insed the tank broken and allowing fuel to slosh away from the pump during cornering??

Does it do it when the tank is full , or just when it gets low??
 

·
Registered
Joined
·
8 Posts
Discussion Starter #4 (Edited)
lumpdog said:
How about your guage not reading correctly and low on fuel??

Or the baffle insed the tank broken and allowing fuel to slosh away from the pump during cornering??

Does it do it when the tank is full , or just when it gets low??



the gage has not worked right for about a year now i thought it may be low on fuel and went and fueled it up it took 11.3 gallons to do that it still does it even with a full tank i just got done changing the fuel filter and it seems better but it still does it. thank you for your help.
 

·
Registered
Joined
·
6,614 Posts
fuel pump?
 

·
Premium Member
Joined
·
388 Posts
Could be a vacume leak at the intake this is very common and will set the codes your talking about. Dump water on both sides of the intake where it meets the block do this with vehicle running, if rpms change this is the problem. Also check air intake from mass air flow sensor to intake for vacume leaks. Vacume leaks are the most common problems that will set these codes together.
 

·
Registered
Joined
·
8 Posts
Discussion Starter #8
i got a fuel pressure gauge today and it has about 15 psi and a couple times it went to about 20 psi and when it acts like it is starving for gas it goes between 5 and 10 psi it does not change much if you rev it up so think it is safe to say i need a new fuel pump.


i was told it was easier to pull the bed off this truck to change the fuel pump is this true or do i need to drop the tank.


update i let it idle for about the last 20 min with the fuel presure gauge hooked up to it and now it has about 40 psi i reved it up and it droped to about 35 psi will a fuel pump do this thank you all for all your help
 

·
Registered
Joined
·
9 Posts
Yes, I would agree its the fuel pump. Changed a bunch of them. Spend the extra money and get it from the dealer or you'll be changing it again in a couple of months. It's easiest to just drop the tank, just be careful when disconnecting the lines. You can buy the little tool at most parts stores, it just slides into the connection and moves the little tabs back. Alot of times the pressure will look OK when you test it but if doesnt hit the target press almost instantly it will start dying and be hard to start. Have fun
 

·
Registered
Joined
·
8 Posts
Discussion Starter #10
well i put a new AC DELCO fuel pump in it last Saturday i drove it all week i put about 1100 miles on it and it ran great until a few hours ago it quit on me again had to get it towed home i checked the fuel pressure and it does not have any at all you can hear the fuel pump running but it sounds like a splashing sound instead of humming does anyone know what could be the problem with this thank you all for your help


.
 

·
Registered
Joined
·
8 Posts
Discussion Starter #11
i got it fixed again there is a plastic flex hose that comes off the fuel pump and goes to the top of the fuel pump assembly it is the main fuel line it came off there is not a clamp on it is just pushed up on it from the factory the old pump is the same way to but when i put it back on i put a small clamp on both ends of the hose so i would not come back off again
 
1 - 11 of 11 Posts
Top