Thanks for the advice helping me fix the fuel prime problem I was having on my M931. I had to prime the fuel pump each time I started it and it would lose prime within 10 minutes after it was shut off.
I replaced all the rubber fuel lines, (6) short hoses on tank selector valve plus supply & return lines for fuel pump.
It seems to be pretty difficult to find anyone that can make up fuel lines with crimped on fittings unless you use bulky hydraulic fittings. Some of the tank valve lines had already been replaced with push-lock fittings so I decided to go that route with all the lines. The best part is you don't have to know exactly how long each line is....just cut hose to match the old lines and push the fittings in and it's done. If the line ever gets bad again the fittings can be reused.
While it was apart I disassembled the tank valve, cleaned it with scotch brite, and replaced the o-rings. (#111 o-ring for shaft & #124 o-ring for cap)
The hose & fittings I got from http://www.discounthydraulichose.com/ They've got just about every fitting imaginable at good prices and were at my door in less than two days.
If anyone is interested I can come up with a list of the fittings that are required.
The water drain valve on the fuel filter can was plugged so I took it apart and cleaned it up. The Napa #3401 filter listed in Parts Reference spreadsheet on this site is indeed the correct filter. I comes with the cover seal and and o-ring for the center bolt that fit perfectly.
After putting everything back together I filled the fuel filter by removing the schrader valve on the top of the filter and pressurized the tank with air until fuel flowed out of the top of the filter can. I used a flat plate with a small hole over the filler neck of the fuel tank and pressurized it using the rubber tipped air blow-off from the shop air.
Once the fuel filter is full it's quick to bleed the rest of the lines with the hand priming pump.
When I first got the truck I replaced the o-rings in the hand priming pump but don't know the exact size because I just dug around in a box of misc. o-rings I had until I found ones that would work.
The result is, now the truck starts right up without priming, even after sitting overnight. The best part is it now idles much smoother. It was no doubt getting air in the system and causing the rough idle.
Thanks again for the help.
I replaced all the rubber fuel lines, (6) short hoses on tank selector valve plus supply & return lines for fuel pump.
It seems to be pretty difficult to find anyone that can make up fuel lines with crimped on fittings unless you use bulky hydraulic fittings. Some of the tank valve lines had already been replaced with push-lock fittings so I decided to go that route with all the lines. The best part is you don't have to know exactly how long each line is....just cut hose to match the old lines and push the fittings in and it's done. If the line ever gets bad again the fittings can be reused.
While it was apart I disassembled the tank valve, cleaned it with scotch brite, and replaced the o-rings. (#111 o-ring for shaft & #124 o-ring for cap)
The hose & fittings I got from http://www.discounthydraulichose.com/ They've got just about every fitting imaginable at good prices and were at my door in less than two days.
If anyone is interested I can come up with a list of the fittings that are required.
The water drain valve on the fuel filter can was plugged so I took it apart and cleaned it up. The Napa #3401 filter listed in Parts Reference spreadsheet on this site is indeed the correct filter. I comes with the cover seal and and o-ring for the center bolt that fit perfectly.
After putting everything back together I filled the fuel filter by removing the schrader valve on the top of the filter and pressurized the tank with air until fuel flowed out of the top of the filter can. I used a flat plate with a small hole over the filler neck of the fuel tank and pressurized it using the rubber tipped air blow-off from the shop air.
Once the fuel filter is full it's quick to bleed the rest of the lines with the hand priming pump.
When I first got the truck I replaced the o-rings in the hand priming pump but don't know the exact size because I just dug around in a box of misc. o-rings I had until I found ones that would work.
The result is, now the truck starts right up without priming, even after sitting overnight. The best part is it now idles much smoother. It was no doubt getting air in the system and causing the rough idle.
Thanks again for the help.