Thunder
3/4 ton status
The coil is a good idea too. I was thinking the problem sounded more ignition related rather than fuel.
CK5
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truck is stuck... again... need help!
- Thread starter FlatBlackBurb
- Start date
I agree, starting fluid will narrow it down. I had a problem like this in my 350tbi, same symptoms, ended up being the fuel pump. Good luck
toupinsgmc
Registered Member
sounds exactly like what happened to my truck i bet its the fuel pump.
FlatBlackBurb
1/2 ton status
ugh. i hate fuel pump bs! but you guys are probably right.
before i fully dive into this and replace my pump once AGAIN.... where is the fuel pump relay again? isnt there a way to have the fuel pump run constantly on manual mode? i'd like to see if i could run my truck that way.
either way the fuel pump is most likely being replaced tomorrow. hopefully it comes with the whole assembly because the fuel level floater broke off some time ago and is floating around in my tank somewhere
before i fully dive into this and replace my pump once AGAIN.... where is the fuel pump relay again? isnt there a way to have the fuel pump run constantly on manual mode? i'd like to see if i could run my truck that way.
either way the fuel pump is most likely being replaced tomorrow. hopefully it comes with the whole assembly because the fuel level floater broke off some time ago and is floating around in my tank somewhere
ugh. i hate fuel pump bs! but you guys are probably right.
before i fully dive into this and replace my pump once AGAIN.... where is the fuel pump relay again? isnt there a way to have the fuel pump run constantly on manual mode? i'd like to see if i could run my truck that way.
either way the fuel pump is most likely being replaced tomorrow. hopefully it comes with the whole assembly because the fuel level floater broke off some time ago and is floating around in my tank somewhere
The fuel pump relay is located on the passenger side firewall. Also the fuel pump is seperate from the sender/float assembly.
FlatBlackBurb
1/2 ton status
i hate that thing. i've replaced that twice since i've owner the truck. i could of saved myself a lot of trouble if i bought a performance module to replace the stock one that fried, but i bought a cheap one and ended up blowing it out a thousand miles later on a hill climb. learned my lesson and went back and got the most expensive one they had (it had a nascar logo on it so i knew it was good
)i'm going to try the fuel pump relay tomorrow just to see if it works. also i'll try pouring a little gas down the carb. its gonna be hard to tell because the truck will run fine for a couple seconds and then die. its almost like the feeling of driving a truck right before the gas runs out, it bogs like crazy. i'm going to check my fuses too. i used to have to pull the ECM-I fuse every time i wanted to kill the truck so i wired up a switch to a fuse holder that now i just turn off when i want to kill my truck. i'll make sure everythings cherry there.
See if you can keep it running by pouring gas in. I usually get a water bottle and poke a hole in it then squirt it in there. You should be able to get it above idle this way too, that is if the problem is the pump. Better to make sure its the pump before you go through the trouble of dropping the tank.
Another thing it could be is the little piece of fuel line that connects the sending unit to the fuel pump. Last time I dropped my tank thinking it was the fuel pump it was actually a hole in the little tube causing the pressure drop
Another thing it could be is the little piece of fuel line that connects the sending unit to the fuel pump. Last time I dropped my tank thinking it was the fuel pump it was actually a hole in the little tube causing the pressure drop
FlatBlackBurb
1/2 ton status
really!
i'll try that tomorrow before i go out and spend $$$ on a new pump.
i know how much dropping the tank sucks but i have a solution for that. since ive had fuel pump trouble in the past (twice) and the last time was about 20 miles after a full tank of gas (38 gallons) i used a jigsaw and cut a trap door right above the fuel pump assembly so now all i have to do is unscrew a couple screws and it's right there. i'll try the water bottle idea tomorrow and see what happens with that
i'll try that tomorrow before i go out and spend $$$ on a new pump.
i know how much dropping the tank sucks but i have a solution for that. since ive had fuel pump trouble in the past (twice) and the last time was about 20 miles after a full tank of gas (38 gallons) i used a jigsaw and cut a trap door right above the fuel pump assembly so now all i have to do is unscrew a couple screws and it's right there. i'll try the water bottle idea tomorrow and see what happens with that
GEORGIA GABE
1/2 ton status
Instead of dumping straight fuel down the TBI try using a small propane torch with a hose hooked to it. Dont light it just use the knob on the torch to adjust the gas flow and put the line down inside the TBI bore. If you wind up replacing the ignition module be sure to use the provides dielectric grease.
gabe
ps. If you need some trouble charts I can post them up for you
gabe
ps. If you need some trouble charts I can post them up for you
GEORGIA GABE
1/2 ton status
To test the module follow this trouble tree.
Thunder
3/4 ton status
There is a red wire not connected to anything hanging out of the fuel pump relay. it is a bypass. If you hook 12V+ up to it the fuel pump should run manually.
It would really be a good idea if you check the fuel pressure.
It would really be a good idea if you check the fuel pressure.
FlatBlackBurb
1/2 ton status
how should i go about checking the pressure?
GEORGIA GABE
1/2 ton status
With a manual fuel pressure gauge. Sorry, but thats the only way I know. I would start with the fuel filter, cut it open and see if it is full of rust. If so then time to pull the sending unit out of the tank. If not then move on to the ignition. Do you loose signal to the coil just before the engine dies? ect ect ect.
gabe
I own and run a shop so I am a little biased. I think truly you would be better off taking it to a mechanic to diagnose the problem if all of this seems a little over your head. Id be willing to bet that paying the Diagnostics on a problem like this will be cheaper than just throwing stuff at it and possibly making more issues than you already have. Just my 2cents. That being said I will help with whatever info I can for the next two days. After that you are on your own BC Im getting married sat and flying to Kauai for 2weeks.
Aloha!
gabe
I own and run a shop so I am a little biased. I think truly you would be better off taking it to a mechanic to diagnose the problem if all of this seems a little over your head. Id be willing to bet that paying the Diagnostics on a problem like this will be cheaper than just throwing stuff at it and possibly making more issues than you already have. Just my 2cents. That being said I will help with whatever info I can for the next two days. After that you are on your own BC Im getting married sat and flying to Kauai for 2weeks.
Aloha!
