Posts: 56
Threads: 22
Joined: Sep 2016
We changed fuel filters at rest area. We were losing power under load . I filled new filters and it started then died . Now roadside says bad fuel pump . I know it is lost prime . We are getting ready for tow . Any suggestions would help ! My number is 6039788916
Bruce & Sue Emerson
Gonic, NH
1986 Newell Coach #117
DD 8V92 Allison 740
Posts: 231
Threads: 52
Joined: Apr 2017
Tried calling
I had a 8v that would loose prime every time we changed filters
Try taking the return line loose at fuel tank
Pump fuel back into fuel tank Through filters
That should correct problem (if it’s not the pump)
Georgeb
Coach 385
Toad Mini Cooper
Posts: 1,171
Threads: 28
Joined: Mar 2013
I have had luck taking suction line off at tank then holding it higher than engine. Pour fuel into line & keep it gravity fed until engine runs smooth. Shut off & QUICKLY reattach to tank. Restart engine & run at 1600-2000 rpm for a cpl of minutes to make sure all air is out of system. George's idea may be simpler than mine.
(This post was last modified: 04-07-2018, 04:51 PM by
ccjohnson.)
Posts: 56
Threads: 22
Joined: Sep 2016
(04-07-2018, 03:15 PM)Georgeb Wrote: Tried calling
I had a 8v that would loose prime every time we changed filters
Try taking the return line loose at fuel tank
Pump fuel back into fuel tank Through filters
That should correct problem (if it’s not the pump)
Thanks George . We are still at rest area . I will see if I can find return line at tank . I’m sorry I missed your call .... I was on phone with good Sam almost all day
Bruce & Sue Emerson
Gonic, NH
1986 Newell Coach #117
DD 8V92 Allison 740
Posts: 837
Threads: 50
Joined: Mar 2014
Can you tell us how roadside determined it was the pump?
I had a fuel pump failure thar exhibited the exact symptoms you have described. In my case the relief valve in the pump was stuck open and not allowing pressure to build at low rpm's. That pump was a real buggar to access on my coach.
Jon Kabbe
1993 coach 337 with Civic towed
Posts: 837
Threads: 50
Joined: Mar 2014
Pushing fuel to the pump as others have described is how the shop determined it was the pump.
Jon Kabbe
1993 coach 337 with Civic towed
Posts: 56
Threads: 22
Joined: Sep 2016
Finally coach is running ...it was prime . Coach is running awesome !
Bruce & Sue Emerson
Gonic, NH
1986 Newell Coach #117
DD 8V92 Allison 740
Posts: 5,591
Threads: 261
Joined: Jul 2012
Bruce,
For the benefit of others who may search this thread in the future if they have the same problem, what was done to prime the system? What worked?
Richard and Rhonda Entrekin
95 Newell, 390 Ex caretaker
99 Newell, 512 Ex caretaker
07 Prevost Marathon, 1025
Maverick Hybrid Toad
Inverness, FL (when we're home
)
Posts: 672
Threads: 70
Joined: Jun 2016
I know this is an old thread, but I am changing the fuel filters tomorrow. We have two of them in series. I am concerned about losing prime. I had a shop change them 18 months ago, and I don't remember any startup issues, but sometimes Murphy travels with me. No one chimed in on the thread as to how you overcome lost prime on an 8V92. I assume (uh oh ) I fill the filters with fuel, install them , and the engine will come to life. Any tips?
Guy & Sue Cobham
Sioux Falls, South Dakota
1984 Classic 40' #59
Posts: 231
Threads: 52
Joined: Apr 2017
385 has a valve before the first filter
I close that valve remove filters then
Fill new ones with fuel, open valve
And start
Georgeb
Coach 385
Toad Mini Cooper
