1994 Rodeo Diesel Fuel Starvation on Cold Mornings
Submitted: Sunday, Jul 26, 2009 at 15:08
ThreadID:
70988
Views:
5983
Replies:
5
FollowUps:
2
This Thread has been Archived
kwk56pt
My Rodeo 2.8 diesel has a fuel starvation issue on cold mornings. It starts and travels for about 500 metres and need priming. once primed runs all day until the next cold morning.The problem goes in summer so it has been a ongoing issue.
The
tank vent which is at the filler neck to the atmosphere is clear. I have put worm drive clamps on the hoses including the return line from the pump. I have sealed the
water trap / fuel primer with silastic and installed a outboard primer bulb behind this and a non return valve behind this which is probably not needed as the bulb should not allow fuel to return.
Any ideas on how I can isolated the source of the air leak ? I have heard this low sulphur diesel makes the injector pump seals go hard. I have no fuel leaks but perhaps a seal in the pump is the culprit, not leaking but allowing air to enter on cold morning ?
Anyone had a similar problem and been able to solve it ? or any ideas how I can exclude the injection pump as the source. I am all ears.......thanks Peter
Reply By: Neil & Pauline - Sunday, Jul 26, 2009 at 15:26
Sunday, Jul 26, 2009 at 15:26
Sounds a bit like you have fuel waxing up. This is why there is summer and winter fuel. When we had trouble on the farm in winter and the fuel company advised to put some kero into the fuel
tank. I can't remember the amount but it is not a great lot. Some fuel additives will also resolve waxing.
just my thoughts as it sounds like what our problem was.
Neil
AnswerID:
376289
Reply By: viz - Sunday, Jul 26, 2009 at 17:49
Sunday, Jul 26, 2009 at 17:49
When we had fuel waxing issues we put hot
water over the injector pump and filter.
One of the indicators in a Nissan Patrol is that the manual pump has sucked itself right in and wont come out after a session of trying to start it. The wax as clogged the filter and there is negative pressure between the manual pump and whatever is downstream - usually the in injector pump. Definitely in that case try and warm the filter and injector pump up. Once the truck has been running for a bit and the fuel system has warmed up it will run OK.
Hope that helps
viz
AnswerID:
376302
Reply By: guzzi - Sunday, Jul 26, 2009 at 18:24
Sunday, Jul 26, 2009 at 18:24
Peter,
You would have somewhere around or over 250,000km on this by now?
Mine did the same as yours and the problem was the front seal on the fuel pump allowing air into the pump. As you said 500 mts and prime, once done it would run and start without problems.
The fix unfortunately is a pump rebuild.
Its only lasted 15 yrs you just cant buy quality these days eh :)
Good luck with it.
AnswerID:
376306
Reply By: Isuzumu - Sunday, Jul 26, 2009 at 20:20
Sunday, Jul 26, 2009 at 20:20
When did you last change your fuel filter. If you have any air getting into the system it will keep stopping. Try draining the filter drain plug in the bottom of the filter see if there is any
water in it, naturally place a container under it so as to determine if that is the case.
AnswerID:
376329
Reply By:- Thursday, Jul 30, 2009 at 21:21
Thursday, Jul 30, 2009 at 21:21
hello to all you people, this is my first time on. In answer to the fuel stavation prob my '90 rodeo had the same trouble for 3 yrs down here in Tas during winter. I found that it was the fuel cap which has 2 valves in it. One to allow pressure to be released and one to allow air back in when the
tank cools. i found that it was not allowing the air back in after a warm ( warm for Tas) day and during the night it would form a vaccum to and the bus would lose power go up in cloud of white smoke and stop. Much priming later it would work. However if you pull the rachet part of the cap off you will find these two valves I ended up cutting a very small vee in the seal that allowed air back into the
tank and have only had the problem three times since ( last 2 yrs)during very cold mornings. My wife was driving it one time and my son the other, the time it did it to me I drove slowly and didn't rev it too hard and with in three klms it had come good. I hope this helps, cheers.
AnswerID:
376870
Follow Up By:- Thursday, Jul 30, 2009 at 22:25
Thursday, Jul 30, 2009 at 22:25
Sorry I should have mentioned that to check this, just undo the cap slightly in the morning before you start the car and drive it with the cap loose. If it is the problem you can then move onto the solution as mentioned above.
FollowupID:
644310
Follow Up By: kwk56pt - Friday, Jul 31, 2009 at 22:00
Friday, Jul 31, 2009 at 22:00
Thanks I appreciate the reply.
Mine appears to have a vent from the filler neck to the atmosphere which I have found to be clear but I might take the cap off at night and refit it in the morning to see if the problem goes away and at least confirm it is not the cap, .......Peter
FollowupID:
644435