On a 1994 f250 7.3 idi im getting fuel to the injection pump but theres no fuel coming out of the pump at all. There is some kind of senor missing on the left side of the of the pump that i come to find out after looking at some pics for the wires that plug to it because i had a wire loose. I dont know what its called but it looks like it has a plunger that rides on the throttle cable. Would that keep the injection pump from working and what is it called. I cant find anything on it and i dont know anything about diesels reallt.

 

Sounds like the high idle solenoid is missing, that won't stop it from running.

On the driver's side of the pump there are two electrical connections. One is the cold idle advance, the other is the fuel shutoff solenoid.

BE CAREFUL! Diesel injection pumps put out VERY high pressure, and can cause serious injury if that gets injected into your skin!

​​​​​​The simple test I would start with is just provide battery voltage to both of these terminals and see if you get fuel. I'm betting your shutoff solenoid isn't getting power so the pump won't get fuel.

Edit: This is what it sounds like you're saying is missing. Just keeps the RPMs up until the engine warms up.



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Hey thanks for the info i really needed some advice

 

And yes that is the part that is missing

 

From where? How could you be at risk of having "high pressure" diesel sprayed on your skin?

 

He said he's not getting fuel from the IP, the IP on these trucks puts out around 2000+psi, if by chance he had a line disconnected, being new to diesels, and possibly had a hand behind the pump, or on the other end of the line, it could happen.

I'd rather warn someone of a possible risk if they don't know what they're dealing with, than find out they had no idea.

Back when all I knew anything about was gas engines, 70psi was about the most I ever worked with, I had no idea any engine would have fuel pressurized anywhere near 2000psi

 

My understanding is that the fuel comes through the injectors at high pressure. But it's the injector orifice itself that creates the high pressure. Without the injector, say you're opening a single injector line nut at the injector, the pressure from the IP is not that great.

Now if you were to remove an injector, connect it to an injector line, crank the starter and point the injector at someone, that could be a Bad Thing.....

 

That's the only way I could fathom having a high pressure injury. But I doubt the OP is going to do that. I've had injector lines off the injector entirely (while cranking to purge air) and it just dribbles out. Don't know how you could "injure" yourself with an IP or its lines.

 

The Injector does not create the fuel pressure, it is the Injection Pump.
When the fuel pressure over comes the spring pressure in the Injector, then it sprays the fuel into the Pre-Cup.
Pressure at the Injector Tip is some where around 1700 - 1900 PSI.


IDK what the fuel pressure in the hard lines is when disconnected from the Injector. It would be quite a bit less, I doubt it would have the pressure to penetrate the skin.


Never put your hand/fingers or other body parts under the Injector Tip when pop testing the injector. Then for sure the fuel would penetrate the skin.
Then you are in deep doo doo.




Charlie

 

The IP flows a metered amount of fuel, because diesel doesn't compress, it builds pressure until it flows the desired amount of fuel. When working against an injector it builds up to the pop pressure where fuel flows. When the line is open there is little to no resistance to flow and it dribbles. It's possible that if you had a hairline crack in the line that you could get some high pressure spray that could be dangerous.

 

Starting power issues solved still won't run.
​​​​​​Got new batteries today plus a jump ..Cranked great. And With a blast of ether it fired once but didn't start.

I ran direct power to the FSS I can hear it open/shut I am assuming it's allowing fuel through because:

i pulled the low pressure return while cranking and it pours fuel and builds pressure if thumb closed.
and
I am getting fuel all over the top of the engine below the IP connections to hard line's, in front of the CDR valve, runs down passenger side of the engine above the starter. Can't seem to identify leak source.
Not getting fuel through the injector #1 after 1-2 min of crank.

Found a missing glow plug in the 3rd cylinder back on passenger side from inside the bus. There is a gold but with an open center . No wire to it and no plug inside that nut like all others.

​​​​​​​What's my next step in diagnosing the obstacle to starting now?

 

Don't use ether at all with these motors unless you know absolutely for sure that the glow plugs will not hear up. Otherwise the plugs will fire off the ether and destroy the engine

 

I assume you're sure the lines are all tight at the IP? There's a seal that leaks on the inlet but it'd have to be pretty bad to stop the engine from running.

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​​​​​​Have you tried cracking 4 lines open at the injectors while cranking? Try this and crank a few times until you get fuel to the injectors, some people have air in the lines to the point they won't start and doing this bleeds the air out.