I have been playing with this for a while now. The truck is running better than ever, but when its hot its hard to start. I cant turn it off to run in a store unless I plan on being in there about 45min or more. 1st time I start the truck I have to kick the ignition twice, bump it the first time (to get the air out I presume) the 2nd time it starts immediately. I still cant find where the air is coming from. no leaks. Once its reached operating temp. I cant turn the truck off and start it again without waiting for a while. Then it starts right up. If it sits for a long time I have to hit it twice. Only way I can start it if its close to operating temp is with a little fluid. Are hot starts a problem for everyone or do I have a problem. Also, ideas about the air getting in are welcome! Thanks in advance for the help. Cant tell ya'll thanks enough. Ya'll have gotten me out of many a tight spot.

 

Any chance I can get a yes or no? Do many of yall have trouble restarting soon (within 5min) after engine shut down?

 

no starts right up, "cummins everytime" (except when the starter goes bad)

 

Starts easyer warm.

 

Check your fuel lines feeding the lift pump. The rubber parts can get old and crack.

IF those look fine..... you might be due for a rebuild.

 

The lines going to it are brand new when I did the big line kit and replaced the fuel pump about 5000 miles ago. I am nervous as to why it is having trouble. I do not want to have to rebuild my pump for at least another 100,000 miles. I guess I'm gonna look it all over again. If there is no leak, are there any good tricks to find where air is getting in. The truck runs great other than the hot start issue. Like tonight the truck sat for over 8 hrs and fired as soon as I hit the ignition. Its kinda crazy!

 

Next time before you try to start it hot, pour cool water on the injection pump. If it lights right off, start saving for a new pump.

 

I looked everything over again and didn't find anything. I was thinking maybe my timing could be the prob. When I put the new pump on I lined the gears up to where they were when I took old pump off and lined the shaft to the key way. I didn't know any better at the time. It has loads of power. I can hit 40psi. and it idles fine. Also, could a leaking injector/s have these symptoms. I will try the cold water. Thanks!

 

You can't get the timing very far off with these pumps, the way you did it works fine. Sounds like you got it set pretty close.

Hard hot starts with good cold starts usually = tired IP.

 

I figured I had the timing right or close enough cause the truck runs great. I just put the pump on couple months ago. I left it alone for the first month to make sure it wasn't gonna be a dud. Guess I didn't wait long enough. Although , I don't think I'll do it any different next time. I like the power to much. I would like to find an old pump to purchase and stick on there for a while and rebuild this one myself. Then I'd have a pump to test with. Thanks for the help and any rebuild tips would be greatly appreciated. It will have performance in mind, of course.

 

Did you try the cold water trick to make SURE it isn't a problem elsewhere?

 

Well I tried the cool water trick. I let the truck get good and hot. Temp. needle in the middle. I used a gallon tea pitcher filled it with water and slowly poured it over the pump. I spent about 2-3min. pouring the water. A slow steady stream all over the pump. Got in the truck and tried to start. It took about 4 tries w/ 1/4 to 1/2 throttle before it started. Not sure if I used enough water or if pumps not the problem. This was at my parents house I'm gonna give it another try w/ the water hose at my place. Any thoughts? Thanks for all the input so far.

 

Got the moter hot again and let the water hose run on it for about 10min. Turned the ignition and she fired right up. Oh well, I've been wanting to get a 2nd pump anyway. If anyone has any tips they would like to share I'd love to hear it. Thanks again for the help guys!

 

When a pump gets worn out, like my situation, what exactly is need to repair it? I've found rebuild kits but all that it consists of is seals. Is this really all I need? Or am I gonna have to send it to a reman shop?

 

It's gonna need a new head and plunger, so it should go to a pump shop.