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Won't stay running when cold

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I have a 94 12v automatic 4x4 #100 fuel plate 4"turbo back straight pipe billet converter shift kit. I just put a new block heater in thinkin it would solve my problem but it didn't help. If the temp outside gets under ~40f truck will fire right up after cycling grid heater then after about 5 minutes it'll start running really rough and if I don't pedal it it'll die and sometimes that won't save it. I hear a different possibility from every person I ask and don't really want to spend a lot of money replacing parts I don't need to replace
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Mine was doing that 2 years ago it was my fuel filter had a pin hole in it letting air into the fuel system.
Also a leak in the fuel line would have the same results.
 

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Def check for fuel lines sounds like its possibly sucking air...does it fire right back up or do you have to crank it a lot?
 

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Discussion Starter · #8 ·
Well I try to prime the lift pump and it's definitely moving fuel but it's making a squeaking sound somewhere around the injection pump after pumping the button about ten times, and it is not wanting to fire at all. I hate the thought of it but I'm thinking it the injection pumps bad....


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Well I try to prime the lift pump and it's definitely moving fuel but it's making a squeaking sound somewhere around the injection pump after pumping the button about ten times, and it is not wanting to fire at all. I hate the thought of it but I'm thinking it the injection pumps bad....


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That's your overflow valve squeaking letting you know that you got fuel primed good enough. Totally normal:thumbsup:
 

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Assuming the batteries had enough charge to crank it good and either or WD didn't get it to fire the only thing it could be is your timing is way, way off.
 

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Check your fuel heater as well. Contacts may be burned out lettin air in. Seals may also be shot and letting air in. Could be any of those but thats a good place to start. The seals are cheap. I ran into this issue a lil while back and that was my issue. I just left the heater off and put the fuel bowl back on
 

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Discussion Starter · #20 ·
I've been out of state for awhile and haven't been able to work on it, I got back and found the seal in the primer button on new lift pump was bad so I got another one, also my fuel heater temp sensor was shorted out at the top of the heater but I'm deleting that all together


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