Morning starting problem - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 16 (permalink) Old 03-25-2014, 01:21 PM Thread Starter
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Morning starting problem

1993 f350 7.3 IDI n/turbo XLT
Just started this. I have to squirt a little diesel in intake to get started.
Anyone have any ideas?
Once it warms up, starts every time.
I even plug heater in overnight still
Won't start unless I prime it

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post #2 of 16 (permalink) Old 03-25-2014, 01:33 PM
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Originally Posted by hobbieman View Post
1993 f350 7.3 IDI n/turbo XLT
Just started this. I have to squirt a little diesel in intake to get started.
Anyone have any ideas?
Once it warms up, starts every time.
I even plug heater in overnight still
Won't start unless I prime it

Injection pump is getting weak in fuel delivery.

Also check glow plug operation. That engine does not like to start easily without their assist.

The question I seek an answer for is simply; why, or why not?

Last edited by Backslap; 03-25-2014 at 01:38 PM.
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post #3 of 16 (permalink) Old 03-25-2014, 01:56 PM Thread Starter
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Neither one of those. Glows r new and it starts and runs just fine after initial start up.
Just wondering if it is the fuel delivery pump on right side.
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post #4 of 16 (permalink) Old 03-25-2014, 01:59 PM Thread Starter
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What's your view on an ele fuel pump before diaphragm pump?
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post #5 of 16 (permalink) Old 03-25-2014, 02:07 PM
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What's your view on an ele fuel pump before diaphragm pump?
If the lift pump is bad it wouldn't matter hot or cold. The engine would not be supplied fuel from the tank.

An electric pump is not a bad idea but remove the mechanical one and install a blanking plate. If the electric pump is installed before the mechanical pump, it can burst the diaphragm in the mechanical pump and fill the engine crankcase with fuel.

You have a Stanadyne pump on that engine with a plastic/nylon roller and distributor ring. These wear and fracture leaking internally. They then do not run proper injection pressure to the injection nozzles.

The symptoms you describe are common as the pump ceases to function correctly. Once rebuilt most of these parts will be stainless steel and outlast the life of the truck.

The question I seek an answer for is simply; why, or why not?
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post #6 of 16 (permalink) Old 03-25-2014, 02:10 PM Thread Starter
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Makes since I will do some checking thanks
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post #7 of 16 (permalink) Old 03-25-2014, 02:34 PM Thread Starter
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How is the best way to check that top pump?
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post #8 of 16 (permalink) Old 03-25-2014, 02:57 PM
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I just removed the pump and took it to an injector shop. They can run a simple test and tell you if it needs rebuilding. I traded mine in on a rebuilt pump.

Dave

2004 Ford F-350 Regular cab with 6.0.
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post #9 of 16 (permalink) Old 03-25-2014, 03:03 PM Thread Starter
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I wish we had a shop like that around here. It's trial and error. U would think it wouldn't run at all if the top pump was bad. One squirt in intake and she runs great and starts right up.
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post #10 of 16 (permalink) Old 03-25-2014, 03:12 PM
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I see Trinity is out in the sticks. Looks like a drive might be in order.

Dave

2004 Ford F-350 Regular cab with 6.0.
Completely Stock.

KK6TNI - HAM Radio

http://bennettlaneshopping.com/ - Our Outdoor/Garden and Kitchen Ware store
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