Warm Starting Issue
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8th Gear
Joined: Feb 2026
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Warm Starting Issue
18 3.5 KR I had the high pressure fuel pump and in tank pump replaced after it let me down while traveling at an Indy shop across the street where we broke down. $2975 Ford parts
Another issue has arose now that it doesn’t start when it’s warmed up unless I press hard on the Bpedal and hold the start button in. Then it catches. And remote start does work either it tries but engine doesn’t ‘catch’.
When it’s cold starts first time every time with the remote start or first time pushing start button.
The local dealer can’t get me in until mid-March. Headed home from Wilm Nc to Pa end of Feb.
No codes or check engine ikon.
Any suggestion what it may be?
Thanks You in Advance.
Another issue has arose now that it doesn’t start when it’s warmed up unless I press hard on the Bpedal and hold the start button in. Then it catches. And remote start does work either it tries but engine doesn’t ‘catch’.
When it’s cold starts first time every time with the remote start or first time pushing start button.
The local dealer can’t get me in until mid-March. Headed home from Wilm Nc to Pa end of Feb.
No codes or check engine ikon.
Any suggestion what it may be?
Thanks You in Advance.
FTE Community Team
Joined: Jan 2019
Posts: 10,781
Likes: 1,512
I assume this is the brake pedal as this is required to get it to crank, but if you're pressing on the gas pedal then this might send us down a different path.
FTE Community Team
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Moderator
Joined: May 2005
Posts: 8,235
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From: San Antonio, TX
The switch on the brake pedal is likely wearing. That's where I’d start.
Anyway, since you were stuck in Indianapolis with a dead fuel pump, this song immediately came to mind
Glad you made it home.
Edit, I misinterpreted Indy, as the town, vs independent shop.
Anyway, since you were stuck in Indianapolis with a dead fuel pump, this song immediately came to mind
Glad you made it home.Edit, I misinterpreted Indy, as the town, vs independent shop.
Last edited by JKBrad; Feb 11, 2026 at 12:38 AM.
Fleet Mechanic
Joined: Jan 2020
Posts: 1,371
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To me, it sounds like the starter. Often a hot starter has issues with the internal windings. As a matter of fact, the 2018 f150 5.0s had a major issue with their starters and 'hot start' issues. I would investigate that, and connections to the starter and battery. The Dealer giving a mid-march appointment. I certainly would be finding an equal, less expensive, more timely mechanic; shouldn't be hard. Good luck!
Fleet Mechanic
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FTE Community Team
Joined: Jan 2019
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- [holding the start button in] and "it tries" are when it is cranking the engine with the starter, right?
- "catches" and "catch" are when it actually starts running and idles on its own, right?
- It cranks and starts normally when cold, right?
Good to know!
More questions:
How old is the battery?
How many miles on it?
How many miles have you owned it?
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8th Gear
Joined: Feb 2026
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Yes ‘catches ‘ = engine actually starts
Yes it cranks and starts when cold. It seems to be an intermittent start thing when warmed up. But panic sets in since being left stranded on fuel pumps issue.
It doesn’t start using the remote start at times when warm either. Then I have to go thru routine of heavy on brake, touch the gas pedal a bit and hold the start button in until I see the tachometer read above 1000.
Battery Is a 3 month old correct size AGM Duralast. The stop/start does work and I push the disengage dash button after I start the truck. Since the new battery as I don’t want to deal with the ‘slam’ when the start happens. The old battery was weak and the stop start didn’t work.
This ‘slam’ start is just another issue haven’t researched to resolve.
The truck has 74300 miles on it. I purchased it Certified in 2020 w 30k on it.
I tow a 16’ boat
I use to do all the maint work myself but
with vertigo now it is not fun anymore. I am a maintenance nut and way ahead on everything. Diff’s, tranny , transfer case plugs, all filters, oil , brakes and fluid change etc
1st time I have had any issue with this truck.
Yes it cranks and starts when cold. It seems to be an intermittent start thing when warmed up. But panic sets in since being left stranded on fuel pumps issue.
It doesn’t start using the remote start at times when warm either. Then I have to go thru routine of heavy on brake, touch the gas pedal a bit and hold the start button in until I see the tachometer read above 1000.
Battery Is a 3 month old correct size AGM Duralast. The stop/start does work and I push the disengage dash button after I start the truck. Since the new battery as I don’t want to deal with the ‘slam’ when the start happens. The old battery was weak and the stop start didn’t work.
This ‘slam’ start is just another issue haven’t researched to resolve.
The truck has 74300 miles on it. I purchased it Certified in 2020 w 30k on it.
I tow a 16’ boat
I use to do all the maint work myself but
with vertigo now it is not fun anymore. I am a maintenance nut and way ahead on everything. Diff’s, tranny , transfer case plugs, all filters, oil , brakes and fluid change etc
1st time I have had any issue with this truck.
Last edited by ‘Oleguy26; Feb 12, 2026 at 07:08 AM.
Thread Starter
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8th Gear
Joined: Feb 2026
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Likes: 4
Good Morning,
So I finally did some research using AI. It seems everyone was pretty much on the mark for the issue. This Ford bulletin states to replace the starter.
Thank you! to all that have responded.
‘Oleguy
Based on the search results,
SSM 47503 is a Ford Special Service Message regarding a "no crank, no start" condition in certain 2017-2018 Ford vehicles.
Key Details of SSM 47503:
So I finally did some research using AI. It seems everyone was pretty much on the mark for the issue. This Ford bulletin states to replace the starter.
Thank you! to all that have responded.
‘Oleguy
Based on the search results,
SSM 47503 is a Ford Special Service Message regarding a "no crank, no start" condition in certain 2017-2018 Ford vehicles.
Key Details of SSM 47503:
- Issue: 2017-2018 vehicles equipped with a 3.3L or 3.5L EcoBoost engine may exhibit a "no crank, no start" condition.
- Conditions: This issue typically occurs in freezing temperatures.
- Source: The information is documented in NHTSA TSB files.
- You can view the document at this link: https://static.nhtsa.gov/odi/tsbs/2018/MC-10144952-9999.pdf.
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8th Gear
Joined: Feb 2026
Posts: 8
Likes: 4
EVAP Purge Valve
1.My starter seems ok. I have no cranking issues.
So I went back to ChatGBT. Here is what AI then responded once I gave the parameters of the issue it asked for.
On a 2018 F-150 3.5L EcoBoost, this is most commonly one of two things:
🥇 Most Likely: EVAP Purge Valve Sticking Open
Why it matches your symptoms:
After a hot soak (20–45 minutes):
- Fuel vapor builds in the tank.
- If the purge valve is leaking/stuck slightly open,
- Raw vapor floods the intake on restart.
- Engine fires → goes overly rich → stalls.
- Pressing gas = clear flood mode → it runs.
✔ Happens only warm
✔ Very common Ford failure around 60–90k miles
Why it matches your symptoms:
After a hot soak (20–45 minutes):
- Fuel vapor builds in the tank.
- If the purge valve is leaking/stuck slightly open,
- Raw vapor floods the intake on restart.
- Engine fires → goes overly rich → stalls.
- Pressing gas = clear flood mode → it runs.
#2 is a leaky injector but you should be smelling fuel.
AI also stated to turn on and off only with out trying to start it 2 or 3x when warm to see if that clears the vapors. This has worked ever time I have gone this route.
It will get a new purge valve when I get home Thursday. I am thinking maybe the new fuels pumps (both) are taxing that purge valve.
I guess this where we have evolved to with these newer trucks. Asking a computer as to what is wrong with my computerized truck since there are no codes up.
I’ll get back here after I change purge valve
‘Oleguy
Thread Starter
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8th Gear
Joined: Feb 2026
Posts: 8
Likes: 4
1.My starter seems ok. I have no cranking issues.
So I went back to ChatGBT. Here is what AI then responded once I gave the parameters of the issue it asked for.
On a 2018 F-150 3.5L EcoBoost, this is most commonly one of two things:
🥇 Most Likely: EVAP Purge Valve Sticking Open
Why it matches your symptoms:
After a hot soak (20–45 minutes):
- Fuel vapor builds in the tank.
- If the purge valve is leaking/stuck slightly open,
- Raw vapor floods the intake on restart.
- Engine fires → goes overly rich → stalls.
- Pressing gas = clear flood mode → it runs.
✔ Happens only warm
✔ Very common Ford failure around 60–90k miles
Why it matches your symptoms:
After a hot soak (20–45 minutes):
- Fuel vapor builds in the tank.
- If the purge valve is leaking/stuck slightly open,
- Raw vapor floods the intake on restart.
- Engine fires → goes overly rich → stalls.
- Pressing gas = clear flood mode → it runs.
#2 is a leaky injector but you should be smelling fuel.
AI also stated to turn on and off only with out trying to start it 2 or 3x when warm to see if that clears the vapors. This has worked ever time I have gone this route.
It will get a new purge valve when I get home Thursday. I am thinking maybe the new fuels pumps (both) are taxing that purge valve.
I guess this where we have evolved to with these newer trucks. Asking a computer as to what is wrong with my computerized truck since there are no codes up.
I’ll get back here after I change purge valve
‘Oleguy
12 mins. I still have the purge issue with warm start meaning, if I just push the start button, no brake, do this 2-3 times for 5 sec each the truck starts. Other wise if hot start I have to push the gas pedal to catch it. Any ideas? The starter is fine. NO codes!
I can not figure which fuse it may be for purge valve ….and right now I want to check the fuse ….which should have been first…doofis!
The start/stop slam start is caused according to the local dealer code 200$ search, it is the Aux trans fluid pump that initiates when the truck start/stop function initiates. That keeps the transmission system fully pressurized.
$275 pump from dealer w 50$ core charge plus labor and the truck needs a reprogram for the unit to function as intended. I have not changed this out yet. I just have to remember to turn start/stop off with dash button or I get a friendly reminder w the ‘slam’. The slam start is that hard I’m afraid it’ll snap a ring gear tooth.
Kevin
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