Starts after hearing a pop coming from the fuel tank

Tiny
JOSEPH-ROBIN POULIN
  • MEMBER
  • 1994 FORD F-150
  • 5.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 160,000 MILES
When cold outside truck does not start. I can hear the fuel pump working in the rear tank which is the one I am using. After I hear a pop coming from that tank the truck starts. Why?
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Tuesday, December 13th, 2016 AT 1:32 PM

8 Replies

Tiny
STEVE W.
  • EXPERT
Do you hear the pop with the gas cap off or on? Does it start immediately after the pop or do you turn off the key and then it starts? Off hand it sounds like a sticking fuel selector solenoid. What is likely is that because you are not using both tanks the valve is not moving free and is settling as the fuel pressure bleeds off overnight. Now you turn the key, the pump has to build pressure enough to open the valve as the solenoids default to the front tank. Try cycling the switch a few times to move the solenoid spools and maybe free them up. Or if you do not intend on using the front tank, go under the truck and bypass the selector valve.
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Tuesday, December 13th, 2016 AT 3:37 PM
Tiny
JOSEPH-ROBIN POULIN
  • MEMBER
Fuel cap is on and it will only pop with the key on then I just turn it over and it starts. Your response makes sense to me I will try the fuel tank select and switch it back and forth a couple of times and see if it helps. Thank you and it only happens when it is cold outside.
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Tuesday, December 13th, 2016 AT 4:20 PM
Tiny
STEVE W.
  • EXPERT
Yeah, the cold makes the plastic parts of the switch contract and stick. We had an ambulance in the shop that, when it got cold you could not switch tanks, it had a 460 that loved gas. Not being able to switch tanks was not good.
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Tuesday, December 13th, 2016 AT 6:43 PM
Tiny
JOSEPH-ROBIN POULIN
  • MEMBER
Thank you.
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Wednesday, December 14th, 2016 AT 2:00 AM
Tiny
JOSEPH-ROBIN POULIN
  • MEMBER
Well I cant find it and now the truck wont start, I found the filter on the frame rail drivers side but cant find the valve. The truck has the 5.0 in it, 1994 ford f150 4x4, do you think this truck came with a with a selector valve for this year? And if not do you think it could be the filter?
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Thursday, December 15th, 2016 AT 11:23 AM
Tiny
STEVE W.
  • EXPERT
Here is what it looks like. Located inside the frame rail almost in line with the front fuel tank filler.
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Friday, December 16th, 2016 AT 6:05 AM
Tiny
JOSEPH-ROBIN POULIN
  • MEMBER
Ok I will check again, I also seen online that the 1994 has a valve in the tank instead of on the frame but I will check it out, thank you for your time and help !
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Friday, December 16th, 2016 AT 7:26 AM
Tiny
STEVE W.
  • EXPERT
OK looking at Fords own info. They used the external selector on trucks up to 89, then switched to a different style but your truck could have the internal FDM depending on the tanks used. Sorry about the mix up. Looks like some of the "factory" info is confused.
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Friday, December 16th, 2016 AT 8:40 AM

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