| Author | Message | ||
| Roy M Strickland (Rstrick182)
Registered Member Username: Rstrick182 Post Number: 1 Registered: 12-2006 Posted From: 68.217.197.156 Rating: N/A |
Hi everyone, my bus run out of fuel while in my driveway. (LOL HAHA) Anyway, I put 10+ gallons of fuel in the tank. I am trying to start it again w/ WD-40. (I took out the air filter, pretty direct route to blower intake...) Its like 2 or 3 feet straight hose from back of air filter can to blower intake. I just need to keep it running long enough for it to hopefully re-prime. I am not too sure if I am maybe using too much or too little WD-40, but I can't get it to run. Everytime between tries, I refill secondary fuel filter container with fuel. The Primary is staying full on its own. When I try to start it, it will run for a jif off of the diesel, but I can't keep it going with WD-40. How much spray should it take? Thanks so much! RS | ||
| Spencer Champion (Spencer)
Registered Member Username: Spencer Post Number: 12 Registered: 4-2006 Posted From: 68.223.103.225 Rating: N/A |
Hi, I think they changed WD 40 and it isn't much good as a starting fluid anymore. I would and do use starting fluid when I have to on my 8v71 and my 6.5 turbo diesel. Is your check valve installed and is it working? Sometimes it takes a couple of times to get it primed. Good luck. | ||
| Richard Bowyer (Drivingmisslazy)
Registered Member Username: Drivingmisslazy Post Number: 1784 Registered: 1-2001 Posted From: 75.108.82.163 Rating: N/A |
I have always been advised that the fuel pump is not self priming. You must get the fuel system completely full up to the fuel pump. Then use ether or WD-40 to start it. Richard | ||
| John Feld (Wvobus)
Registered Member Username: Wvobus Post Number: 9 Registered: 2-2005 Posted From: 204.184.224.5 Rating: N/A |
The DD fuel punp works well at 1100 RPM, below that it don't pull well. Use ether and have someone mash the throttle down until it has a chance to charge the whole fuel system. Careful with the ether, don't overdo it. John F. | ||
| Earl Bonnell (Earl8ky)
Registered Member Username: Earl8ky Post Number: 3 Registered: 12-2006 Posted From: 207.162.163.20 Rating: N/A |
You are going to have to get your fuel pump full of fuel. It si a gear pump and will not pump air. You can take the outlet hose from the pump and hook a vacuum pump to it snd pull the fuel up to the pump or you can install a primer pump. What ever you do you have got to get the fuel pump full of fuel. | ||
| Larry Higuera (Larryh)
Registered Member Username: Larryh Post Number: 9 Registered: 6-2006 Posted From: 64.192.95.189 Rating: N/A |
Hello WD40 is now powered by compressed air and water don't believe it spray some bare metal and let it sit a couple of days and look at the rust starting. A quick easy way to charge your fuel system is to buy a garden sprayer and take nozzle off valve and adapt fitting to your inlet on primary filter fill with diesel and pump up and open nozzle and start pressure into filter's loosen return line at rear bulkhead until fuel flows start engine and remove line after shut down and reinstall fuel line and restart bus and viola a primed system and forget the ether and WD40. LarryH | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1142 Registered: 12-2000 Posted From: 67.181.163.170 Rating: N/A |
Roy - You probably need to put 25 - 30 gallons of fuel in the tank, too! Ten probably wasn't enough. . .  | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 256 Registered: 11-2005 Posted From: 206.40.238.4 Rating: N/A |
If is a DD engine driven fuel pump it requires no prime other than filling the secondary filter with fuel. This requires pumping to the secondary or filling it manually, preferably through the primary filter, until you get fuel flowing out of the secondary air bleed opening. It will then start if the fuel is clean, the temp is not too low, your compression is good, the injectors are pumping and timed and the battery spins the engine fast enough!! | ||
| Frank Rowe (Frankid)
Registered Member Username: Frankid Post Number: 4 Registered: 10-2006 Posted From: 63.239.248.1 Rating: N/A |
Recently while repriming a few different GMC buses with the 8V71 DD, I had great difficulty. After using lots of time and energy, the problem was a pin hole somewhere in the fuel supply line. Poop. I made a temp repair by getting a 3/8 shop air hose and plumbing hose into primary fuel filter. After Pushing fuel from the fuel fill opening, and making the engine run, the hose was placed into the fuel tank. Finding the pin hole in the fuel supply line can be very elusive. I guess all GMC buses will have this fuel line failure, now or later. Running a new nylon or rubber line is not fun. Frank | ||
| Tony Gojenola (Akbusnut)
Registered Member Username: Akbusnut Post Number: 2 Registered: 11-2006 Posted From: 69.178.30.245 Rating: N/A |
Gus: When you fill the secondary filter by pumping or applying pressure to the primary filter, you are, in fact, priming the pump. The pump is between the two filters. Or, did I misunderstand your post? tg | ||
| Phil Dumpster (Phil_dumpster)
Registered Member Username: Phil_dumpster Post Number: 4 Registered: 5-2005 Posted From: 71.112.29.215 Rating: N/A |
Harbor Freight sells a hand operated oil transfer pump (item number 42137) which can be permanently installed in the fuel line before the primary filter. Then, if you ever run out of fuel you can reprime the system up to the engine driven fuel pump easily. | ||
| jim (Jimmci9)
Registered Member Username: Jimmci9 Post Number: 8 Registered: 3-2004 Posted From: 198.213.138.99 Rating: N/A |
if the primary fuel filter is staying full and the secondary empties each time, you have a suction leak allowing air to enter...check the fuel lines and connections very carefully....and replaceany that have the slighest crack... or you'll be doingit over and over, until you do...phil has a great idea,and i'd also recommend a 12vdc electric fuel pump... | ||
| Jim Wilke (Pd41044039)
Registered Member Username: Pd41044039 Post Number: 97 Registered: 2-2001 Posted From: 69.77.151.82 Rating: N/A |
When I have to re prime my 6-71, I remove the pipe plug on the top of the primary fuel filter, install a pipe to hose fitting & use an outboard motor fuel bulb/hose assembly. You can buy this at Wal Mart for about $12 without the end fittings which you don't need. When the bulb pumps solid fuel (into the 5 gallon diesel jug I carry on board) I remove & replace the pipe plug. The bus always starts. I keep the hose assy on board for other projects. I have always meant to install a permanent valve & hose barb on the filter but only have to reprime about every 2-3 years so haven't gotten to it yet. Jim-Bob | ||
| Mark Renner (Boomer)
Registered Member Username: Boomer Post Number: 25 Registered: 11-2006 Posted From: 12.180.53.193 Rating: N/A |
I used to carry a one quart plastic container with my gear oil (Power Punch) for topping off my hubs. Filled it with fuel, inserted the nipple into the end of the fuel lines, and squeezed. After filling the filters of course. Quick and cheap. Then we started installing the Fuel Pro 380 series fuel processors. What a super piece of equipment. I highly recommend them on any engine. Throw those canister or spin on filters away. When the fuel level rises to a line near the top of the clear housing, that's when it's time to change the element (last one I changed was around 9.00) We found that the fuel filter change interval was extended by about 4X. You can get them with heat elements too for you guys in the cold country. Made by Davco and so good that Detroit Diesel bought the company. I think DD wants over 300.00 for a new one, but I buy mine at a truck surplus place for around 75.00. You can investigate them at www.davcotec.com. You'll wonder why you ever ran with two filters. | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 259 Registered: 11-2005 Posted From: 206.40.238.17 Rating: N/A |
Tony, I think we're saying about the same thing, I just had never thought of filling the filters as priming, but that is exactly what it is if the pump happens to be full of air. However, just filling the filters when they are changed is probably not considered priming-I really don't know. I agree with Jim9 but would add that, in his example, the leak is between the primary filter and the pump. Much easier to find than an air leak in the supply line to the primary-that is a whole 'nother problem! I like Jim-Bob's system, sure beats a pump at the tank, but this won't work if there is a leak in the tank-to-primary supply line. Jim, does this fill the primary filter at the same time? I wouldn't think it would but hadn't thought about it before. A valve and hose fitting would work great here. I've only had to do this one time so it is not a high priority now-would be on a long trip in miserable weather though!! | ||
| Stephen Fessenden (Sffess)
Registered Member Username: Sffess Post Number: 674 Registered: 1-2002 Posted From: 67.142.130.35 Rating: N/A |
The reason 10 gallons is not enough is that the tank has a wide flat bottom and it takes 7 to 10 gallons to raise the fuel level one inch. If you have a leveling system, figure out which way to tilt the bus to get the fuel level higher where the fuel pick up is. I just used WD 40 last week to start an engine. Works on small gas engines too. Maybe you are not spraying enough or it is too cold for a WD 40 start. It was 70 degrees here in sunny Tennessee last week when I used it. For colder temps you need ether, but if you can start it with WD 40 I have been told it is better for the engine. Try a hand pump sprayer and use a lot. Slow down spraying only when it starts to run too fast, but don't stop until you hear the engine running on its own, doesn't start to die as soon as you decrease the spray rate. You need a continuous spray with WD 40 or ether. | ||
| larry currier (Larryc)
Registered Member Username: Larryc Post Number: 5 Registered: 2-2007 Posted From: 207.200.116.13 Rating: N/A |
I'm not crazy, but I've been priming 8V71s with 2 cans of either for years. One person in the drivers seat, foot on the throttle,wide open, 0ne can of either in each hand spraying at the same time. As soon as it hits the govenor your done. One can of either is not enough to get engine speed up to the govenor and won't work. | ||
| Jim Connelly (Desertbum)
Registered Member Username: Desertbum Post Number: 5 Registered: 2-2005 Posted From: 207.200.116.13 Rating: N/A |
Hi Guys, I don't want to change the problem but I have a similar one and maybe someone can help me with it or advise me how to ask it better. My 4106 runs great but it doesn't want to start after sitting for 6 days. It starts after one day of sitting but not 6 days later. Batterys are good and fuel is good.It did start and chug a bit but then it died and would not start again. Any thoughts? Thanks for any advise.WD-40 didn't get it to start | ||
| Pete/RTS Daytona (Pete_rtsdaytona)
Registered Member Username: Pete_rtsdaytona Post Number: 306 Registered: 1-2005 Posted From: 72.40.13.12 Rating: N/A |
Jim Sure sounds like your oneway check valve (between the fuel tank and your first filter) is leaking fuel back to the tank Get a barbed by 1/4-MPT fitting to screw into the plugged port on your first filter (first in line from the tank) - using a garden sprayer filled with clean diesel fuel - connect and clamp the sprayer hose to the barbed fitting and pump fuel into the filter - those things make enough pressure to fully prime your diesel then go start the engine - bet it works !! Pete RTS/Daytona | ||
| R.C.Bishop (Chuckllb)
Registered Member Username: Chuckllb Post Number: 62 Registered: 7-2006 Posted From: 4.240.144.253 Rating: N/A |
Check the Archives....lots there on this subject. FWIW RCB |