My truck has just started a deal when you drive it and it sits for hr or so it don't want to start when it's hot.Starts real good in morning but seems after it gets hot it's hard to start when it sits.Motor has 135,000 on it and am wondering if the stock fuel pump is going away as IP and other fuel stuff was replaced 9000 miles ago?Also today when it wouldn't start I opened the filter bleed and nothing came out?I came home after finally getting it to start and shut off the motor and it restarted fine...What's going on as I figure it's a fuel issue?
Hard Start When Hot
- Thread starter rpm427
- Start date
Hydro-idi
Full Access Member
Where did you buy the injection pump? This is a classic sign of a worn IP needing to be replaced.
rustygold
Full Access Member
I would start with lift pump and check for leaks.
Hydro - idi is right sounds like classic ip failing.
Sent from my SAMSUNG-SM-G870A using Tapatalk
Hydro - idi is right sounds like classic ip failing.
Sent from my SAMSUNG-SM-G870A using Tapatalk
Did you open the filter bleeder with the engine running (when there should be fuel pressure there) or when is was off (no pressure)?
Mechanical or electric lift pump?
Have you tried the ice the IP trick? Meaning, when it won't start when hot, place a bag of ice water on the IP and let the IP cool off. If it starts after cooling the IP down, but wouldn't start a few minutes before (when it was hot)......... you need an injection pump.
Heath
Mechanical or electric lift pump?
Have you tried the ice the IP trick? Meaning, when it won't start when hot, place a bag of ice water on the IP and let the IP cool off. If it starts after cooling the IP down, but wouldn't start a few minutes before (when it was hot)......... you need an injection pump.
Heath
Macrobb
Full Access Member
Yup, pretty much. That's generally the failure mode, especially if you have a worn or poorly-rebuilt IP trying to push fuel into new, high-pressure injectors.
Also, just a thought, but how fast does the engine crank over? It should be slower when cold, but if your engine is cranking slowly for one reason or another(usually worn out brushes on the starter), the IP won't build enough pressure. This is exacerbated by the worn IP clearances and high temperatures.
Also, just a thought, but how fast does the engine crank over? It should be slower when cold, but if your engine is cranking slowly for one reason or another(usually worn out brushes on the starter), the IP won't build enough pressure. This is exacerbated by the worn IP clearances and high temperatures.
sjwelds
Full Access Member
Hmm a Moose Pump is generally thought to be the best around. I'd say try the lift pump? or go electric pump...
Macrobb
Full Access Member
I'd definitely contact him then. You can always have a bad unit, or something could have happened one way or another.
Whether you can get a replacement(if it is indeed the issue) is what matters.
The general consensus is that you've basically only got Conestoga, R&D IDI performance, and Typ4 as options for a quality pump.
When I first got my own high-dollar R&D IP, I had a very odd issue with it("laggy" timing). Customer service was great - I got the guy(Justin) on the phone quickly, he walked me through a few tests to make sure it wasn't something else, and then fixed it at no charge. Still not sure what the original problem ended up being, and the replacement has worked flawlessly for multiple years now.
*that's* the mark of a good shop. Stuff will always happen; what matters is that you end up with a good solution at the end of the day.
Whether you can get a replacement(if it is indeed the issue) is what matters.
The general consensus is that you've basically only got Conestoga, R&D IDI performance, and Typ4 as options for a quality pump.
When I first got my own high-dollar R&D IP, I had a very odd issue with it("laggy" timing). Customer service was great - I got the guy(Justin) on the phone quickly, he walked me through a few tests to make sure it wasn't something else, and then fixed it at no charge. Still not sure what the original problem ended up being, and the replacement has worked flawlessly for multiple years now.
*that's* the mark of a good shop. Stuff will always happen; what matters is that you end up with a good solution at the end of the day.
pelky350
Full Access Member
I would check fuel pressure at the filter head, maybe filter old? good clean diesel in tank? not likely to be ip issues conestoga Is known for quality but stuff can happen sometimes. If there happens to be a issue with the pump I'm sure Mel will help with it, I belive his pumps come with some kind of warrantee
shawn deere
So many wrenches, so little time...
Mine runs about 5-6psi. Got a holly red electic lift pump tho. Mechanical pump was at 3-4 but it was tired. Anything over 8psi starts to advance the timing in the ip
madpogue
Full Access Member
IIRC, the IP hot failure acid test is to be at the ready when it happens, and douse the IP with COOL (room temperature, NOT COLD) water. If that helps it start, that indicates the IP.
The no start issue..... will the issue only happen when the truck has sat for while (hour or so)? Will it start if you immediately try it after shutting it off.
Fuel pressure gauge you can hook up at the filter head and see what it's doing?
Where in KY?
Heath
Fuel pressure gauge you can hook up at the filter head and see what it's doing?
Where in KY?
Heath
pelky350
Full Access Member
Filter head should be 4-7psi
