F150 Bifuel, intermittant CNG - Ford Truck Enthusiasts Forums

F150 Bifuel, intermittant CNG

Thread Tools Search this Thread
Old 09-27-2011, 02:39 PM
gsorter gsorter is offline
New User
Thread Starter
Join Date: Mar 2011
Posts: 1
gsorter is starting off with a positive reputation.
F150 Bifuel, intermittant CNG

I have a 2001 F150 bi-fuel CNG. Truck has 80K miles, and I just flushed the CNG with isopropyl and put a new coalescing filter on. Truck runs well on regular gas, and well on CNG if alt light is on. My problem is that the CNG light only comes on occassionaly. It never flickers, or flashes. It is either on or it is off. Sometimes I can start the truck on CNG for a minute, shut it off, and when I restart it, the CNG light is off. I recently stopped for lunch, truck was on CNG. Before I got out, I shut engine off, and restarted on CNG as a test, it worked. When I was done with lunch 20 minutes later, CNG would not activate, even though truck hadn't moved an inch. I've checked all the fuses, including the 2 on the battery block, and they are all good. The CNG system seems to turn on more often when it is warm out, but even then it is sporadic. What might explain this?
Reply With Quote
Old 12-24-2012, 04:06 PM
EnergyFuture EnergyFuture is offline
New User
Join Date: Nov 2012
Posts: 4
EnergyFuture is starting off with a positive reputation.
Try to turn the key to the "on" position (battery powers the radio and dials but engine has not yet received ignition) and wait for the green light to show up. If it doesn't show up, turn the truck off and try again until the light turns on. Once the green light is on, turn the ignition. Check out my other thread on here.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
1991 460 need some EFI education cngf350 1987 - 1996 F150 & Larger F-Series Trucks 12 09-20-2017 03:07 PM
Ford van Econoline E series CNG all parts free swap for gasoline parts, (Expedition, F150?) GreenMM Ford Truck Parts for Sale 13 01-07-2017 09:49 AM
CNG/Propane Questions AZFordLover 2017+ Super Duty 21 07-29-2016 10:14 AM
2003 F-150 Bi-Fuel - pops occasionally on fillup and when ignition turned on and doesn't run on CNG baskervi Alternative Fuels, Hybrids & Mileage 9 12-31-2012 08:43 PM
CNG IN F-150???? ArtsBest General Automotive Discussion 9 05-07-2012 02:00 PM

Go Back   Ford Truck Enthusiasts Forums >

2001, alt, bi, bifuel, cng, f100, f150, ford, fuel, lightning, problems, sale, switch, truck, trucks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -5. The time now is 12:37 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: