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Fuel level says 60 gallon. Drove several miles from my house, stopped on a 5 degree hill pointed down. Coach ran when I put in several ounces into davco filter then quit.  Any thoughts if pickup tube is uncovered from the slope? Seems odd you can't drive with 60 gallons. Any suggestions welcome.

[bikestuff]

John,
Get a stick and measure fuel level in tank. The engine pickup is near bottom but the generator pickup is a little higher. Will your generator run? If so, you have plenty of fuel. If not, you may have air in the line to the fuel filter. Others can explain how to fix that.

bill

[Richard]

fill the Davco to the tip top and put the screw top on tight. Crank the coach from the back and observe carefully.

Do you see bubbles coming up the sides of the Davco? If you see bubbles are they focused above the fuel inlet?

Bubbles all around the edge says leaking seal. Bubbles only above the fuel inlet means you are sucking air somewhere. Could be out of fuel, a loose fitting, hole in the fuel line, or broken fuel pick up time.

Once you have run the fuel lines downstream of the filter out of fuel, it can take a number of cranks to get it going again. If it sucks it dry before you can get it to run, you can feed the Davco from the top with a five gallon jug of diesel.

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after filling with 25 gallons, I changed fuel filter , filled up the bowl and it ran for about 30 seconds. Generator runs fine. I decided to take off some fuel lines, maybe have them remade, before I read Richards reply, but most are not only hard to get a big wrench on.the ones I could were so tight I am assuming the fitting is not leaking. so I took of the line from fuel filter to fuel pump and cranked engine while my finger plugged the inlet- nothing. I then took that line of the input to the fuel pump connected to the compressor and cranked engine. Slightest vacuum- I could do more with a straw. so my thinking is the pump completely failed.
Now to find a replacement. any leads let me know.
I happen to be across from a fire station and a guy stopped by and said their in house mechanic rebuilt their dd 60 pump.

The connection to the tank of the main fuel hose looks very difficult to remove. since i put what i think is alot of fuel to cove a brken pickup tube, I am thinking thats not it.
Obviously I dont know what kind of vacuum should be at the pump but my test seems conclusive. (until I replace the pump)

[johnkosir]

Richard knows alot more about this than I do, but if the pump is not full of oil it will not have a lot of suction, I would try to feed oil in to the filter like Richard said, try to prime the pump, does the hand  pump in your fuel tank work,712 has a hand pump in the fuel tank, try to feed fuel to the fuel filter with a electric fuel pump, hook up the electric pump to the line that goes to the fuel tank an see if is getting pure fuel or are there air bubbles in the discharge, on my Windsor allege plugged  my pick up line had to blow it out with compressed air

[Richard]

I gotta ask stupid questions. What led you originally to conclude this was a fuel issue?

Have you checked for any engine error codes?

You did not comment if you observed air bubbles in the Davco.

Seems to me that the first step in diagnostics is to determine if the problem is the fuel pump, or the fuel supply.

If this were me, the first step would be to disconnect the fuel inlet from the Davco and use appropriate plumbing fittings to feed fuel from a 5 gallon jug directly into the Davco fuel inlet. If the engine runs like that, then you have eliminated the fuel pump.

Based upon the results of that diagnostics. The mechanical fuel pump on a Series 60 is not very good at drawing a vacuum. It is a gear pump, not a diaphragm pump, meaning it doesn’t move air very well at all. You can buy rebuild kits. Pretty simple to replace the seals and gaskets. Pay attention to the seal orientation. One is oriented to keep fuel in the pump, and one is oriented to keep oil in the air compressor. Get it backwards and something will leak out the weep hole.

If the problem is now the fuel supply. A couple of understanding points to make. One, there is a check valve in the line. It is located just beyond the point where the line exits the tank. Two, because of that check valve, pressurizing the line back in to the tank does not work. To disconnect the fuel line, the vanity panel on the tank must be removed. Then I used a crow’s foot wrench to get into the space and loosen the connection to the fuel pick up tube. Third, the Newell provided priming pump is tied into the fuel line, but IIRC the connection is beyond the check valve.

If you pump the priming pump furiously for a couple of minutes, do you get the fuel level in the Davco to rise?

817 223 2056

I feel you buddy. I was stranded like this and trying to avoid a tow at all costs.

[Rixson]

So your scenario sounds almost exactly like a scenario that I had with our Beaver. It has a CAT 3126 and a whole different fuel supply system, but... After many attempts like all of those suggested above, it actually ended up being a sensor on the engine that tracks the amount of fuel flow.... It's ironic this happened when we were also very low on fuel and coming down a hill that we had just climbed....much like you describe in your situation..
My point is, I spent days trying to solve what I thought was a fuel supply problem, and it turned out to be an electrical problem ultimately...

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No fault codes in pro driver. Reason I think it's fuel now is when I fill the bowl it eventually start after 10 to 20 seconds of cranking and runs for 10. I will hook up a fuel feed to the filter next.
Perhaps there's not enough fuel in the filter to completely get air out.

Another interesting thing is I replaced orings on the primer. Can air leak into the system from primer?

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Although I am going to do testing as Richard recommended, I am thinking a leaking check valve may be cause. Parked downhill on fairly steep slope, the fuel would run that direction. Limited time to fix so may do numerous things rolling

Anyone have check valve on and source? Going to be difficult to get out to get that info would like to have new one asap.