Injection pump
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New User
Joined: Aug 2004
Posts: 4
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Injection pump
I have a 91 ford 7.3 Deisel ( an old ambulance) I have trouble starting when its cold and plugged in, I crack the injector lines to check for fuel none there, Cover truck put some heat to it bang she starts. Now it is summer and starts nice but when it first starts it idles rough with intermitant smoke out of exhaust. Installed new injectors, return lines, o rings,glow plugs. 98000 miles, Motor runs good after warmed up but feel there is a lack of power. Is it time for an injection pump?? It had 52000 miles when I bought it, Started on the coldest day -18 With out being pluged in. Now I know winter is coming And the same problem to will return. Any info would be greatly appreciated. Thanks P.S.Every one knows this engine is a dog , but What are your feelings on the Banks Turbo for this engine?
Logistics Pro
Joined: Apr 2004
Posts: 4,292
Likes: 5
From: NJ where fun comes to die
Welcome to FTE. Different people have installed the torbo and liked it. Try doing a search, maybe there are other options that would interest you, and not cost as much. An ambulance is heavy and is a little slow anyway. Is your fuelpump working ok? Is the fuel pressure set right?
Freshman User
Joined: Mar 2004
Posts: 31
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From: South LA
injection Pump
Check the fuel transfer pump discharge pressure. Make sure it pumps a positive 3 - 7 psi and can hold the pressure when you stop cranking the engine. The internal vallves on the pump may be leaking fuel back to the tank drawing air into the fuel system from an air leak in the fuel return system or back through the injectors and pump if they are indeed worn out.
hard to believe that at only 52000 miles. That clock must have gone around at least once especially an ambulance.
hard to believe that at only 52000 miles. That clock must have gone around at least once especially an ambulance.
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New User
Joined: Aug 2004
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Trike// Bell
It had only 52000 miles when I bought it in 2000, it was from a small rurel town in ct. Actuall mileage! I replaced injectors,glow plugs, return lines, o-rings,fuel pump with correct pressure. It is driving me crazy. but thanks for the info. If you think it may be injection pump let me know.
Senior User
Joined: May 2003
Posts: 455
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From: Alaska
I would take a close look at the glowplug system and make sure it is working properly, faulty relays, controller and wiring can contribute to a poor cold start.
I don't know this for a fact, but from what I've read, a bad injection pump usually causes a poor hot start.
I don't know this for a fact, but from what I've read, a bad injection pump usually causes a poor hot start.
Freshman User
Joined: Mar 2004
Posts: 31
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From: South LA
I would guess that the injection pump would be the last thing to check except for maybe compression pressure should be around 350- 400 psi.
Also make sure the starter cranks the engine at least 200 rpms or it's not going to crank easy and smoke white when it starts. I just rebuilt a starter for that reason. It would start cranking slow like weak batteries and then speed up. The brushes and motor were oil soaked from valve cover leaks.
Also is the smoke white or black?
Also make sure the starter cranks the engine at least 200 rpms or it's not going to crank easy and smoke white when it starts. I just rebuilt a starter for that reason. It would start cranking slow like weak batteries and then speed up. The brushes and motor were oil soaked from valve cover leaks.
Also is the smoke white or black?
Freshman User
Joined: Mar 2004
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Transfer pump
Find20 wrote:
Is it possible to remedy the fuel transfer pump, without replacing the whole fuel injection pump unit?[SIZE=3][COLOR=Blue]
Is it possible to remedy the fuel transfer pump, without replacing the whole fuel injection pump unit?[SIZE=3][COLOR=Blue]
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Junior User
Joined: May 2004
Posts: 62
Likes: 0
I think what they are referring to as far as a fuel transfer pump is the supply pump located on the front right corner of the engine. Yes, you can change it without doing anything to the injection pump. The transfer pump is what pulls fuel from your tank and supplies it to the injection pump.
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