| Author |
Message |
bobm (64.12.105.172)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 13, 2002 - 9:12 pm: | |
My 8v71 has been sitting for several months. i filled both filters and it starts but runs out of fuel in one minute and the filters again are almost empty. the fuel line run is about 25 feet when i remove the fuel filter i can feel and hear a slight vacuum where the fuel enters the filter. there seems to be a check valve where the fuel line enters the fuel filter housing could a bad check valve prevent me from priming the main fuel line by allowing the fuel to drain back everytime i remove the filter or am imissing something else?? |
Glenn (Paso) (209.179.205.163)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 13, 2002 - 11:05 pm: | |
Yes,it sounds like the check valve is not holding
the fuel. |
Scott Whitney (24.205.239.26)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, January 14, 2002 - 1:06 am: | |
I replaced my check valve recently. Mine was restricted rather than not holding. You might try bypassing the check valve and running the engine from a gerry can first. Also, keep in mind that even if the check valve is ok, it can take several filter removal and fill-ups to get the prime back.
Scott |
bobm (152.163.195.212)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 15, 2002 - 6:05 pm: | |
Thanks, the check valve had a twisted o-ring stuck in it , i removed it, cleaned it up and after two fillings of the filters it runs fine, now i have to fix a massive airleak under the front end |
Buswarrior (Buswarrior) (152.163.207.181)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 15, 2002 - 9:20 pm: | |
A garden sprayer makes a great fuel system primer.
(especially for someone going full timing, what are you going to need a weedsprayer for once you're on the road?)
Permanently install a quick disconnect fitting with a shut off valve in an appropriate plugged port in the fuel filter. Install the opposite quick disconnect on the end of the sprayer hose.
Simply attach, pump up and open the shut-offs. Instant prime! With good quality hardware, you should be able to minimize the spillage, leakage and stink. No need to goof with filling the filter casings.
Don't forget to keep track of the fuel level in the sprayer. It does get used up....
happy coaching!
buswarrior |
Steven Gibbs (12.148.43.7)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 16, 2002 - 7:18 am: | |
The massive air leak may be a stuck purge valve in your air dryer. It is located on the bottom of the dryer and will prevent air buildup if stuck open.
Remove, clean and lubricate like you did the check valve and that may fix your problem. |
FAST FRED (209.26.87.88)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 16, 2002 - 8:21 am: | |
TO prime the fuel lines , and filter I use a "Mity Vac"hand pump .
The metal one is best , and is usually used to change the hudraulic brake fluid every 2 or 3 years , as most car mfg suggest.
Just pull a plug at the last filter . pump by hand for a min or two, and the coach fuel pump can take it from a full filter.
About $50 at your local auto supply.
FAST FRED |
Stephen Fessenden (Sffess) (63.27.88.192)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 16, 2002 - 8:33 pm: | |
Fred is there a fitting on the last filter that will fit the tubing or do you need to add a brake bleeder type fitting? Great technique. I've used it on Peugeot, VW, and Mercedes and GM 6.2/6.5 at the last injector.
Could use a larger reservoir though, to keep diesel fuel out of the pump itself. A hard plastic disposable surgical suction canister should do. Holds about 2 liters, 1/2 gal. But get only an unused one. |
Buswarrior (Buswarrior) (64.12.103.28)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 16, 2002 - 8:56 pm: | |
There you go folks!
Where else on the internet will you be told that you can suck and blow to accomplish the same thing?
BNO forever!
ooh, is this going to make it past the censure?
happy coaching!
buswarrior |
FAST FRED (209.26.87.89)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, January 17, 2002 - 9:16 am: | |
THE MITY VaC will pull, suck , lift , drag fuel thru the filters and fuel line.
IT could be used to fill the engine driven pump too,
but if there is air free fuel thru the filters , no need.
The folks that want to pressure prime have to disconect at the tank , to push fuel thru everything, sounds like loads more work.
Fuel at the pump will refill the injectors and fuel lines AFTER the pump for ya.
The Mity Vac has adapters that will pull from any opening , no need for a brake fitting,
just pull the final plug , pump , and wait a couple of min.
FAST FRED |
Rodger Manecke (Rodger) (63.11.248.55)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, January 19, 2002 - 8:09 pm: | |
This probably isn't the best method but it worked for me.
The bus was parked on a slope, nose down, for a few weeks. I preheated it, fired it up and while building air, went about pulling off the wheel covers, yanking out the chocks, etc. Then the engine quit. Uh oh. I checked the fuel filter, a Detroit Diesel Pro canister type with a glass bowl. It was empty. The check valve at the filter and to the firewall are fairly new.
Apparently while sitting so long the fuel had drained back into the tank which, on a Prevost Champion. is located just behind the right front wheel.
Not having a clue as to the proper bleeding method, I punched two holes in a tennis ball and stuck the air nozzle from my pancake compressor, in one hole. I set the air pressure at 30 psi. Next I loosened the fuel line connection at the inlet side of the fuel pump and blew air into the fuel tank via the filler until fuel came out at the loosened connection. The engine cranked through a couple of strokes, fired up and ran fine.
I'm considering installing a 12VDC fuel pump near the tank on a by-passable line to purge the line should this happen again.
Rodger |