New IP..........New Problems

[Shadetreemechanic]

We are both having the exact same issue, only difference is I have an electric fuel pump that makes it bearable.

 

[Smokey73]

Will the electric pump help bleed everything out, cause I've been considering one

 

[Shadetreemechanic]

Yes, it pumps away while the glow plugs are cycling. Before the electric pump I would often have to let the starter run for 20 seconds or so, now worst case scenario is 5 seconds.

 

[jtate]

what about the olive seals on the hard lines? the line from the fuel pump to the filter housing and the hard line from the filter housing to the ip. dont ever rule out the schrader valve for air intrusion also, thats why i put a metal valve stem cap with the rubber seal in it on mine.

 

[Smokey73]

I've been fooling around with this truck for about 2 weeks now, and I still haven't come up with a smoking gun, or even really made any headway. The problem seems to be so random, that I have a hard time reproducing it. With all the clear line hooked up, sometimes when you kill it, they will fill with air, sometimes they won't. It dosen't make any difference if it will start or not, the problem seems to be more temperature related, than anything else. Today, however, right before I called it quits, I did get it to where it wouldn't start right away, you had to crank on it for about 10 to 15 seconds, while it was turning over I tapped on the pump with a screwdriver and it busted off. Killed it right away and let it sit for a minute. Tried it again with the same results. I think next week end I'm gonna swap out the IP with a spare one and see if it makes any difference.

 

[Shadetreemechanic]

I have been messing with olive seals and return lines to no avail and got to thinking...... Has anyone ever added air to the schrader valve on the filter head to see if a small leak will become more apparent? I know it will be a b%^$@ to start afterward, but if it makes my air leek seep or hiss I think it might be worth it.
Thoughts?

 

[turbo_joe]

my truck is doing the same thing, not starting after getting warm, when it doesnt start after its been warm ill try a little ether and it just starts cranking really slow, like ether locking and still doesnt start unless i let it sit for a while. a while ago it had a problem with loosing my prime so i think i have all my leaks fixed, im gonna try a new pump this weekend, unless i can think of someting else

 

[Agnem]

my truck is doing the same thing, not starting after getting warm, when it doesnt start after its been warm ill try a little ether and it just starts cranking really slow, like ether locking and still doesnt start unless i let it sit for a while. a while ago it had a problem with loosing my prime so i think i have all my leaks fixed, im gonna try a new pump this weekend, unless i can think of someting else

Sounds more like a classic IP heat soak issue to me. Do a search on heat soak if you don't know what that is.

Either is DEATH in the wrong hands, and in the right hands, not good for your motor.

 

[jtate]

Sounds more like a classic IP heat soak issue to me. Do a search on heat soak if you don't know what that is.

Either is DEATH in the wrong hands, and in the right hands, not good for your motor.

cant you take a heat soaked ip and cool it with water, just to pinpoint if thats the real problem with heat soaking?

 

[Shadetreemechanic]

So no one has tried pressurising the fuel system with air to find a leak? I think I am going to try it, maybe 8-10psi and look for air leaking out of the system.

 

[icanfixall]

Pressurizing the fuel system may work but... Air will not pass thru the injection pump. Now I might be wrong about that but on my motor after I turn up or change pumps the electric pump will not clear all the air in the fuel system. I need to crack open some hard lines and crank it till I see fuel. Then tighten them up and fire it up. Sure, it runs ruff for a while but smoothes out when the air is gone. In my directions on the Moose pump it states to leave the return line off the top of the injection pump and run the electric pump till fuel comes out of that. It never happened for my. Not sure why. If the pump is air free it will pressureize the hard lines easier and faster.

 

[Agnem]

cant you take a heat soaked ip and cool it with water, just to pinpoint if thats the real problem with heat soaking?

Yes, but if the problem is NOT heat soak, you stand a good chance of siezing the hydraulic head and snapping the input shaft. Best to do it only if your despirate and ready to replace the pump anyway. 12 oz of room temp water poured over the hydraulic head, allow to sit for 60 seconds, then crank and cross your fingers. If it starts right away, it's the pump. If it never starts again, it's still the pump, and probably something else.

 

[Smokey73]

Well, I tried everything I knew to try. I finally gave up and swapped pumps with one off of the old '88 out back. The truck runs like a dog, but it hasn't failed to start yet. It even seems to start better. Before I pulled the new(bad) pump I checked to the timing one more time and it was much more advanced than where I thought I left it last time. This was puzzling to me and I thought this was the problem. I set it back to 9 degrees, but that didn't help it any, so I pulled it. First thing monday I'm going back to M&D to try again.

 

[icanfixall]

If the pump timing is "changing" on you thats a sure sign the pump is shot or just about to let go on you. If you pull the top cover look in and see if there is any plastic floating around in it but... Don't try to reinstall the cover without talking about it here first. If the cover in not set correctly the motor will start but it will run away. The pump is no longer able to moderate the fuel delievered to the motor. It has to do with the clip under the lid... I'm really no expert and I don't work on the pumps.... But work on everything else...

 

[Smokey73]

Well i took the pump back to the injection shop this morning. The guy behind the counter, the same one who sold me the pump and the same guy I've been dealing with for years, pulled me another pump and was writing up the ticket. I thought it was a done deal till the manager came out from his office and started asking questions to the salesman. He asked how I knew the pump was bad. I told him the problems I was having, how I tried everything I could not to condem the pump and finally how I threw an old pump on and fixed the problem. He told me that there must be a return line restriction and that he wouldn't give me another pump untill they bench tested it....... This upset me...............I asked him how hot they would get the pump on the bench because my main problem seemed to be heat related. I told me they would get it up to about 160 and that if there is a problem, they would find it, if they don't, he won't give me another pump..............I'll find out tomorrow whether or not I'm gonna need bail money.