Some 40 series guys suggested I post this on this forum.
I have an HJ47 late model 1982. A quick history if that helps understand what might have caused the problem now: The truck was sitting in Washington for 8 months, started a couple of times there but never really driven. I had it towed to Gary Mudrak in Sonoma. He did some work for me. When I went to leave, there was some air in the fuel line that he bled and then it seemed to run fine. I drove it for about 1.5 hours and it died. Bled the fuel line at the filter like he did. Ran another couple hours. This repeated itself several times down to San Diego. The last leg, though, lasted about 4.5 hours w/o any problem. It died as I was pulling into my driveway. I bled it and drove it about 2 miles the next day. I then left to go out of the country for 2.5 months (previously planned trip). Was not driven during that time. Came home and had to bleed it to start. Would run for a couple minutes and die. Repeat this 5-6 times and that's the way it is today.
Here's what I have done so far:
1. replaced the secondary fuel filter (not the water separator).
2. replaced the primer pump with a Bosch.
3. checked the fuel line back to the main tank and couldn't find anything obvious.
4. checked the switch valve (auxiliary and main tank--see photo)
Here's what I haven't done:
1. isolated each element in the link (the primer pump/fuel feed pump, injectors, injector pump, switch valve, primary filter--water separator). At one point, the injectors were bled. There's no fuel leaking around the injectors or injector pump where fuel enters or at the primer pump.
2. tried replacing current fuel line with clear to see if there is air visible and where it starts.
Here are a couple questions:
1. If I run fuel directly from a pail to the injectors, would that work without having any pressure in the line? I'm not familiar enough with this engine to know what I can isolate easily and what I can't.
2. The primary fuel filter/sediment/water separator is very old. I don't see any pin hole leaks but not sure I would and I haven't dismounted it to try to look on all sides. Today, I replaced the clamp on one of the lines because there was a hint of very very slight fuel leak (glimmer at end of hose and about 1/2 inch fuel damp at the bottom of the hose. This is in the last pic. I don't yet have a replacement filter for this to try.
3. I haven't followed the lines that have two bolts in them but would anyone know w/o that info. what these two lines might be going to or coming from or what it means?
4. Should I be concerned about the kink in the fuel hose that feeds the auxiliary tank?
Thanks for any help! This is frustrating and time consuming.
switch valve
fuel line from the auxiliary tank (don't think it's a return line)
bolts
kinked hose
partial pic of the fuel filter; the one line hides the other behind it
I have an HJ47 late model 1982. A quick history if that helps understand what might have caused the problem now: The truck was sitting in Washington for 8 months, started a couple of times there but never really driven. I had it towed to Gary Mudrak in Sonoma. He did some work for me. When I went to leave, there was some air in the fuel line that he bled and then it seemed to run fine. I drove it for about 1.5 hours and it died. Bled the fuel line at the filter like he did. Ran another couple hours. This repeated itself several times down to San Diego. The last leg, though, lasted about 4.5 hours w/o any problem. It died as I was pulling into my driveway. I bled it and drove it about 2 miles the next day. I then left to go out of the country for 2.5 months (previously planned trip). Was not driven during that time. Came home and had to bleed it to start. Would run for a couple minutes and die. Repeat this 5-6 times and that's the way it is today.
Here's what I have done so far:
1. replaced the secondary fuel filter (not the water separator).
2. replaced the primer pump with a Bosch.
3. checked the fuel line back to the main tank and couldn't find anything obvious.
4. checked the switch valve (auxiliary and main tank--see photo)
Here's what I haven't done:
1. isolated each element in the link (the primer pump/fuel feed pump, injectors, injector pump, switch valve, primary filter--water separator). At one point, the injectors were bled. There's no fuel leaking around the injectors or injector pump where fuel enters or at the primer pump.
2. tried replacing current fuel line with clear to see if there is air visible and where it starts.
Here are a couple questions:
1. If I run fuel directly from a pail to the injectors, would that work without having any pressure in the line? I'm not familiar enough with this engine to know what I can isolate easily and what I can't.
2. The primary fuel filter/sediment/water separator is very old. I don't see any pin hole leaks but not sure I would and I haven't dismounted it to try to look on all sides. Today, I replaced the clamp on one of the lines because there was a hint of very very slight fuel leak (glimmer at end of hose and about 1/2 inch fuel damp at the bottom of the hose. This is in the last pic. I don't yet have a replacement filter for this to try.
3. I haven't followed the lines that have two bolts in them but would anyone know w/o that info. what these two lines might be going to or coming from or what it means?
4. Should I be concerned about the kink in the fuel hose that feeds the auxiliary tank?
Thanks for any help! This is frustrating and time consuming.
Last edited: