Question about 1991 Ford F350

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Diesel Wait light does not come on, starts rough and thermostat pegs out.

Loaned my 91 F350 Diesel out to a co-worker, came back with the wait light not coming on, starts rough and idles high. Temp gage pegs out with in a couple minutes of starting, Has coolant. Vehicle used to start easy no problems would pop right off after wait light went out. What could this be?

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Either you have loose connections to the glow plugs or the fuseable link to the glow plugs is bad check this out and i'm sure your problem will stop. please rate the solution..thanks

Posted on Sep 21, 2008

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1 Answer

Wont start back after refueling?


your not mentioning if this is gas or diesel allthough im hoping it's a diesel being a f350 (gas is not so practical at this size truck)
anyway if it's a diesel and you have a hot hard to start problem it's most surely your injectors getting stuck open and draining off your fuel pressure it only takes one stuck open to drain off all pressure but a 91 should have em all replaced at same time any good diesel mechanic would know how to confirm this with a few simple tests

Oct 30, 2013 | 1991 Ford F350

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Find and replace fuel injectors on my 2000 F350 diesel


i have sen co workers(heavy duty techs) work on diesels fords. its not easy to do injectors on those.you attempt to do it yourself and youre gonna create more work and more problems.

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What does the light code "HOLD" means?


Hold on it a rough road ahead

when does it come on at start up?
if it a diesel might be like a wait light (wait or hold until glow plugs heat up)
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Nov 22, 2010 | 1994 Mazda 626

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2006 ford f350 diesel fuel gauge read empty then full whats wrong


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1 Answer

1999 f350 diesel engine shut down, turns over but


that fuse powers pcm fuel heater and some other things. when the fuse blows the pcm shuts down. causing it to not run. usually its the heater that is bad. it is located at the back driver side by the fuel pump. you can unplug it and see if it starts. if so you will need to replace the heater

Jan 06, 2010 | 2002 Ford F350 Super Duty DRW Reg. Cab

1 Answer

2005 f350 that sometimes starts.Problem seems to


This is a diesel I assume.

Before anything else, you have to find out if it is a fuel delivery problem or a glow plug problem or, are your batteries tired? (Not cranking fast enough) Batteries have to be replaced every 3-5 years on a diesel.

1) Check your lift pump. It brings the fuel to the injection pump. It should make a buzzing noise when working. (You can feel the vibration if you put your hand on it.) It should buzz as soon as the key is turned to the on position without having to crank the engine.)

2) Check glow plugs. If the wait light only goes on for two seconds, then your glow plugs are burning out. (The wait light usually is on for at least ten seconds. Longer if it's really cold.)

3) Or the injection pump itself is weak. (Hopefully it's not this, as it can be very expensive to replace. We only want to do this as a last resort.)

Let me know

Oct 07, 2009 | 2005 Ford F 350 Super Duty

1 Answer

Replace fuel pump on 03 Ford F350 diesel


simple : obtain replacement pump from parts provider (no used stuff)

Now help me out here: thats the year they were bolted to the pass side front of engine
and not inside the tank right? (better go look to see for sure)

using a tube wrench unscrew the fuel lines (i use large wire nuts to temp block off fuel leakage)

with a 12 mm wrench undo the two side bolts holding the pump to block

wiggle pump it should come straight off

clean mounting place on block with solvent let dry

silicone back (or use gasket that comes with pump ) of pump

apply pump to block (depending on where crank stopped you may have some tension on arm you will have to overcome to get flange to meet block )

use locktite (blue)or simmiliar thread lock on bolts retighten firmly but not hang up the dog tight

use light grease or vasolene on tube connections don't try to tighten dry

Now the fun part your diesel now has air in the fuel system

there are two ways to remove this ( hard and harder)
your choice here are both methods

loosten the fuel supply line for #8 injector ( I did not say remove) 1 full turn ought to be enough

crank engine 30 seconds only
wait 5 minutes for starter to cool down
crank engine 30 sec again
did it start but runs rough while it's still running tighten #8 injector (caution fuel under high pressure)
engine smooth out good your lucky
engine did not start yet
wait 5 minutes
crank engine 30 sec again
start yet
if so tighten #8 injector up

Now here's something I've done to my diesel to make this much less a hasstle

trace fuel line as it comes up from pump
obtain a small low pressure electric fuel pump and a two short pieces of fuel line
and a few clamps

use tube cutter and cut fuel line just before it bends to go in filter
deburr edges
slide tube and clamps over pipe (both sides)
insert pump observe flow arrrow towards filter

the wires of pump can be stretched over to #1 battery terminals

now any time you change a filter or open your fuel system for any reason
all you need do is connect pump to battery
open sharader valve on top of filter for a few min
and start truck as normal
then disconnect wires and stow away for another day

Jun 29, 2009 | 2003 Ford F350 Super Duty DRW SuperCab

1 Answer

1991 f350 7.3 diesel hard starting in am


you will find that it may be the glow plug timer is faultycausing the glow plugs not getting hot enough

Mar 18, 2009 | 1991 Ford F350

1 Answer

1989 ford f350 diesel wont start


Bad glow plugs most probably or the glow plug controller. to check your glow plugs remove wire and check with ohm meter to ground. if they are working you should get a low ohm reading if one has a high ohm reading it is bad. if all injectors check good make sure your fuses are ok, also check and see if you hear the controller click when you turn the key to on. Does the wait to start light come on?

Dec 27, 2008 | 2004 Ford F350

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