Ran good now will not start.

[Ronw435]

Hi All,
I have a 1986 F250 with a na 6.9. The last time I had it running was about three weeks ago. It ran fine but has always been a little sluggish to start. Compression is 335-340 cold. No leaks from anywhere. Lift pump is putting out a steady stream of fuel. Lift pump is manual cam driven pump. The fuel switch clicks when I turn the key on. Not a lot of pressure on the Schrader valve but fuel runs out. Fairly new glow plugs with manual activator.
I went out to start it and it started to fire once but from then on it just cranks. It has two good interstate batteries that I keep topped off with a Battery tender. The engine cranks over quite fast but will not start now. Do the IPs go out like that? Was running but now nothing. The fuel tank is 3/4 full. I use this for plowing a mile and a half mountain road in the winter but do not use it a lot more than that. It rides like it has concrete tires on it....lol. This truck was "supposedly" only used to plow a church parking lot in Colorado. It puts out a little blue smoke until fully warmed up. Probabley sticky rings? Might be the reason for the low compression also?? I had changed the oil and put in the Hot Shot stiction eliminator at the oil change hoping to free the rings up some about a month before this happened.

I guess my question is, is it possible that the IP just took a dump? Should there be pressure on the schrader valve? I know the compression is a bit low but in the winter it always started right up with the heater plugged in .

Thanks for any help.
Ron

 

[Clb]

Verify
fuel delivery in a 30 second crank with FRESH battery 's
prove no air intrusion
check fsv
bypass fuel system and catchcan fuel to mech pump then gravity to ip
report back...
Godspeed

 

[Ronw435]

Thanks Clb I will do those things asap.

Thanks for the recomendations

Ron

 

[Clb]

Look up air intrusion
Check fuel solenoid for 12v

 

[Ronw435]

Can I ask how to gravity feed the IP? Can I remove the top and do it that way?
I have verified 12 volts to the FS. It also clicks when 12 volts is applied.

 

[Ronw435]

Well I opened the top of the fuel pump and found this laying in there???? It looks like half of a maybe 1 inch washer. Looks like its time to contact one of the members that rebuild idi IPs. Fuel pump was full of fuel. I checked the fuel solenoid with it off and it looks great and works when engergized.

 

[Clb]

,gallon jug up high above up, girl line to the IP inletbypass everything...where did ya find that ?
In the Top of ip you mean?

 

[Ronw435]

Yes I opened the top of the IP and found half of a large washer laying in there. IP was full of fuel. Called CDD and they said it will have to be rebuilt. I ordered a rebuilt IP and rebuilt injectors coming from CDD.

 

[Ronw435]

Well I pulled the pump and injectors today. The injectors seemed awful clean. All I have done is wipe them off with a paper towel. Also all the injectors had the letter E stamped on them except one. It had a D. Can someone tell me what the letters mean?

 

[IDIBRONCO]

Those were codes for the different types of injectors when they were new. After being rebuilt, those letters really mean nothing. Each rebuilder sets them to his/her preferred specs, not what Stanadyne set them to.

 

[Ronw435]

Thanks IDIBronco.