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Hi all I'm new to the forum and this is my first cummins truck. It's completely stock aside from the vp44 and my newly installed raptor FRRP 100gph lift pump. The vp44 isn't a hotrod as far as I know I believe it's a stock replacement, previous owner had it done. The truck runs fine at any speed, matter of fact it has more pulling power and better throttle response so I'm reluctant to say my VP is bad? My issue is it is very hard to start after installing my raptor. The morning pervious to install it started perfectly fine it fired extremely fast, got home from work did the install and it's been hard to start ever since. I have to give it some throttle otherwise it won't fire. I ordered a new vp44 overflow valve, past that any ideas?
 

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Welcome to the forums! Great info here.
With the hard start right after the replacement lift pump you most likely have an air leak.
Reseat / seal every fuel feed and return connection.
Including the ones you think weren't touched.
Air can get in before diesel can get out.
 
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