Solved starting issue on 98.5

[Vaughn MacKenzie]

Almost 2 years ago I was having a chronic crank but no fire problem on my 98 club cab. I wanted to post an update but the thread was closed for some reason—> https://www.turbodieselregister.com/threads/cranks-but-no-start-then-starts-immediately.265542/

It kept randomly having an issue where it would crank and crank but not fire. Shutting the key off and trying again it would usually fire immediately, smooth and no more smoke than the usual startup puff.. I finally solved it by replacing the overflow valve. Good call by Boeing Diesel, he suggested that on the original thread. Anyway one inexpensive overflow valve later and we’re happily motoring again!

 

[GCroyle]

Vaughn,

Don't own one but curious what the overflow valve is supposed to do vs what you determined yours wasn't doing.

Gary

 

[SnoKing]

Vaughn,

Don't own one but curious what the overflow valve is supposed to do vs what you determined yours wasn't doing.

Gary

It controls the amount of fuel the VP-44 injection pump returns to the tank. When I replaced my VP-44 they supplied a new overflow valve and required one to install a new lift pump to have warranty of the replacement VP-44.

 

[GCroyle]

SnoKing,

Thanks, simple ball, seat, cap and spring thingy.

Thanks,

Gary

 

[Joe Mc]

Hmm, wonder if that could be what's going on with mine?
https://www.turbodieselregister.com/threads/service-for-formula-1-mach-5-injections.269471/
Some time back I replaced the one that Thoroughbred Diesel sent with new VP for no reason other than I was ordering other stuff and needed to reach a certain $ amount for free shipping. Still have one TB sent. Maybe I'll give that a shot, it's free and can't hurt?