TheAMCForum.com Homepage
Forum Home Forum Home > The Garage > AMC 6 Cylinder Engine Repair and Modifications
  New Posts New Posts RSS Feed - Engine dies, not fuel issue?
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Click for TheAMCForum Rules / Click for PDF version of Forum Rules
Your donations help keep this valuable resource free and growing. Thank you.

Engine dies, not fuel issue?
 Post Reply Post Reply Page  <123>
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
purple72Gremlin View Drop Down
AMC Addicted
AMC Addicted
Avatar
Charter Member

Joined: Jul/01/2007
Location: Illinois
Status: Offline
Points: 16614 		Post Options Post Options   Thanks (0) Thanks(0)   Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Aug/01/2019 at 11:11am
and I have a YF on my 1974 258. And I drive it over 100 miles one way. Have had this car for 4 years or so. Never vapor locks.  I know about enthenol,  but I dont believe it causes the vapor lock problems. Because none of my carburetored cars do it.
Back to Top
tomj View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jan/27/2010
Location: earth
Status: Offline
Points: 7555 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tomj Quote  Post ReplyReply Direct Link To This Post Posted: Aug/01/2019 at 9:08pm
73gremlin, then i won't doubt your experience. i'm sure it's as you say. clearly we have lots of variables here. i apologize for going too far afield on too little information.

for jdarosa's problem here, the issue is, there's not enough information -- yet -- to know if there's a mechanical issue or other problem -- or vapor lock -- and only some kind of testing will tell.
1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5
http://www.ramblerLore.com
Back to Top
jdarosa View Drop Down
AMC Nut
AMC Nut
Avatar

Joined: Oct/31/2014
Location: Portland, OR
Status: Offline
Points: 264 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jdarosa Quote  Post ReplyReply Direct Link To This Post Posted: Aug/02/2019 at 6:34pm
Thanks for all the feedback everybody. Been off the grid and working on it a few days. 

I let it warm up and then it dies, after about 10 mins. There IS fuel to the carb immediately after it dies. The ECM is a replacement installed new last September. The electric fuel pump is at the back of the car, at the tank, and temps are not that hot, so no vapor lock. 

I'm not sure how to test the return line from the dual outlet fuel filter. It runs back to the tank, and looks to be intact. I can try the tip of loosening/removing the fuel tank cap too.


That leaves the Motorcraft module and the cap/rotor/pickup coil, correct?



Edited by jdarosa - Aug/02/2019 at 6:42pm
1968 American 440 – 232/AT 4dr
Back to Top
Heavy 488 View Drop Down
AMC Addicted
AMC Addicted


Joined: Apr/27/2019
Location: In the
Status: Offline
Points: 3557 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Heavy 488 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/02/2019 at 6:47pm
You say gas is present at the carb then check for spark should be a yes or no. 
Ive had duraspark boxes quit on a 6 month old car. I've had them quit on 20 year old cars.


Edited by Heavy 488 - Aug/02/2019 at 6:50pm
Back to Top
purple72Gremlin View Drop Down
AMC Addicted
AMC Addicted
Avatar
Charter Member

Joined: Jul/01/2007
Location: Illinois
Status: Offline
Points: 16614 		Post Options Post Options   Thanks (0) Thanks(0)   Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Aug/02/2019 at 7:03pm
Originally posted by jdarosa jdarosa wrote:

Thanks for all the feedback everybody. Been off the grid and working on it a few days. 

I let it warm up and then it dies, after about 10 mins. There IS fuel to the carb immediately after it dies. The ECM is a replacement installed new last September. The electric fuel pump is at the back of the car, at the tank, and temps are not that hot, so no vapor lock. 

I'm not sure how to test the return line from the dual outlet fuel filter. It runs back to the tank, and looks to be intact. I can try the tip of loosening/removing the fuel tank cap too.


That leaves the Motorcraft module and the cap/rotor/pickup coil, correct?

thats what I said earlier.....
Back to Top
purple72Gremlin View Drop Down
AMC Addicted
AMC Addicted
Avatar
Charter Member

Joined: Jul/01/2007
Location: Illinois
Status: Offline
Points: 16614 		Post Options Post Options   Thanks (0) Thanks(0)   Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Aug/02/2019 at 7:05pm
Originally posted by Heavy 488 Heavy 488 wrote:

You say gas is present at the carb then check for spark should be a yes or no. 
Ive had duraspark boxes quit on a 6 month old car. I've had them quit on 20 year old cars.
and this^^^^^^^^   and I have seen a new box go one week....and it crapped out.  It wasnt the problem to start with. Put the origunal back in and the car woke up.
Back to Top
maximus7001 View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar

Joined: Jun/27/2011
Location: Winnipeg,Canada
Status: Offline
Points: 1086 		Post Options Post Options   Thanks (0) Thanks(0)   Quote maximus7001 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/03/2019 at 12:48am
Originally posted by purple72Gremlin purple72Gremlin wrote:

Originally posted by Heavy 488 Heavy 488 wrote:

You say gas is present at the carb then check for spark should be a yes or no. 
Ive had duraspark boxes quit on a 6 month old car. I've had them quit on 20 year old cars.
and this^^^^^^^^   and I have seen a new box go one week....and it crapped out.  It wasnt the problem to start with. Put the origunal back in and the car woke up.


x3 on the spark box. Had a ton of those go bad over the years. Always kept one in the trunk just in case.

Another thing to look for is a tank venting problem. These cars have a return line with a check valve inside the return hose. My 81 Concord sedan would die 1 mile after leaving a gas station if they put the cap on properly. In the beginning it cost a couple of tows until I figured it out. My fix was to just sit the cap on the filler and not tighten it. It always did it. Had the car for decades. I also had to do this with my 85 Eagle Wagon. If that works for you then you can just drill a tiny hole in the cap so it can be tightened all the way (or locked if you have a locking cap).


Edited by maximus7001 - Aug/03/2019 at 12:50am
1968 Javelin SST

1997 GMC Safari AWD

2001 Daewoo Nubira SX (Winnipeg only model)

1997 Honda Accord EX (Canadian Model)

Winnipeg, home of the Jets.
Back to Top
Heavy 488 View Drop Down
AMC Addicted
AMC Addicted


Joined: Apr/27/2019
Location: In the
Status: Offline
Points: 3557 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Heavy 488 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/03/2019 at 7:18am
That's why you troubleshoot instead of part swap for days and weeks.
Does the carb squirt gas as it should? It's either a yes or no.
Does it have a steady spark? Same yes or no answer.
Back to Top
purple72Gremlin View Drop Down
AMC Addicted
AMC Addicted
Avatar
Charter Member

Joined: Jul/01/2007
Location: Illinois
Status: Offline
Points: 16614 		Post Options Post Options   Thanks (0) Thanks(0)   Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Aug/03/2019 at 8:57am
Originally posted by Heavy 488 Heavy 488 wrote:

That's why you troubleshoot instead of part swap for days and weeks.
Does the carb squirt gas as it should? It's either a yes or no.
Does it have a steady spark? Same yes or no answer.
Amen.
Back to Top
tomj View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jan/27/2010
Location: earth
Status: Offline
Points: 7555 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tomj Quote  Post ReplyReply Direct Link To This Post Posted: Aug/03/2019 at 11:29pm
Originally posted by maximus7001 maximus7001 wrote:

[Another thing to look for is a tank venting problem.


easy test: drive with the cap loose or off. if it dies, not the cause.
1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5
http://www.ramblerLore.com
Back to Top
 Post Reply Post Reply Page  <123>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.03
Copyright ©2001-2019 Web Wiz Ltd.

This page was generated in 0.109 seconds.
All content of this site Copyright © 2018 TheAMCForum unless otherwise noted, all rights reserved.
PROBLEMS LOGGING IN or REGISTERING:
If you have problems logging in or registering, then please contact a Moderator or