Seems to be a more frequently occuring complaint.

One problem seems to be Lift Pump operation differences, '94-'95 OBDI vs '96-'02 OBDII.

OBDI lift pump runs only when engine is cranked, at START.

OBDII lift pump, controlled by PCM, runs in WAIT TO START and START, priming the Inj Pump long before START demand.

Extended START event after 5521 installation in OBDI appears to indicate Inj Pump has temporarily lost prime.

Other factors, such as weak lift pump, poor fuel filter sealing, loose fuel supply hose clamps, cracked\deteriorated hose, etc, will contribute to hard start.

As will incorrect timing procedure, bad glow plugs, bad fuel, etc.

HA ! ! ! as if ANY of those things could POSSIBLY be wrong with MY truck ! ! !

Yep - that badboy went from crank-to-run in 1/2 crank revolution with 5288 Inj Pump, to 2-5 crank revs, with new 5521 Inj Pump.

Talk about yer embarassin' situation - I don't EVEN drive no vehicle that's gonna leave copper starter-armature flakes on the ground underneath !

Well, here's one ole gearhead's solution - try it.......you'll like it!

What is required is for the lift pump to run in WAIT TO START, then continue running in START, where the OPS will take over as oil pressure increases with engine running.

What you'll be doing is connecting the two circuits together, such that neither circuit back-feeds the other - meaning WAIT TO START will not crank starter, and START will not GLOW, yet the lift pump will do it's thing at both events.

What you'll need is two @ 50volt 1 amp mimimum epoxy RECTIFIER diodes from Radshak - 1N4001, 1N4002, etc.
2amp or 3amp diodes - 1N5406, 1N5408 equiv - are more suitable.
Each epoxy diode will have a white band around one end.

What you will do is cut the purple\white lift pump wire from the 5a CRK (crank) fuse, splice in a rectifier diode to the short purple\white wire you left on the fuse-holder, and splice a second diode from the purple\white lift pump wire to the dark blue wire from the Glow Plug fuse-holder.

What needs to be done is connect the banded-end lead-wire on each diode to the purple lift pump wire.
Lead-wire at opposite end of one diode will connect to the CRK fuse, lead-wire at opposite end of second diode will connect to the Glow fuse.

What will promote electrical safety is to insulate any bare leads\wires.

What will happen is +12volts on either diode will energize the Lift Pump Relay, which applies pre-run power to the lift pump motor - the other diode blocks +12v to it's circuit.

What you should notice, all other things being equal, is easier starting.

What do you think? About that?

What? me worry? :cool:
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I like mine better, just run a wire off the fuse box thats hot with the key on to the lift pump. Its fool proof.

tdg, wont that cause a problem if you get into an accident? hate to see that expensive fuel spraying all over the place.

...? If you get into an accident, is your first concern about how much fuel you can recover. If you break a line you'd be in just as much trouble, There's a lot more expensive parts in the truck than the fuel, and I wouldnt consider diesel to be a firehazard. I've used it to put out more fires than start them.

Umm... Tex it's an enviromental hazard and when they have a bad one out on the freeway hazmat has to come in and clean the freeway before traffic can continue. They don't leave any fuel, oil or tranny fluid to wash away. It's possible you'll remember to turn the ignition off after a wreck but not guranteed you'll get the chance.

Yep - isn't your truck the one with the missing-loping problem?

Wonder if it could be Diesel Fuel in the cylinders?

You know - quenching combustion............

Have you tried GASOLINE?;)

Diesel Fuel is a fire hazard! Period!:badidea:

... a vehicle that gets into an accident is a firehazard, period!

C'mon, what kind of an argument are you guys bringing here? If you get into a serious enough accident that a fuel line between the pump and the engine gets broken, your in a SERIOUS accident thats going to be leaking fuel anyway and hazmat is going to be on scene reguardless. Its just as likely that when that happens, your electrical system is going to go inop and the pump will quit.

But, if it don't.............:help:

Shouldn't be debating this, anyway, imo - never defeat safety considerations where batteries, fuel and infernal combustion is the name of the game.

I'm with TDG on this one, mine's been hotwired for quite some time now. If I get in a wreck a fuel leak is really going to be the worst of my concerns. Diesel will only ignight under extreme temperatures (read flame already present), not electrical spark, if that was the case we would all be debating which spark plugs to use.

Umm... Tex it's an enviromental hazard and when they have a bad one out on the freeway hazmat has to come in and clean the freeway before traffic can continue. They don't leave any fuel, oil or tranny fluid to wash away. It's possible you'll remember to turn the ignition off after a wreck but not guranteed you'll get the chance.Well If Safety and enviromental hazard are a concern then everyone put your Cat and Muffers BACK on. Cats are needed for the enviroment and the mufflers are for noise reduction for everyones safety. RIGHT :lol:

I run my LP wired direct cause I WANT TO. I have always been able to turn off the vehcile after wrecks. I just don't believe that it is very likely to be a problem. Your bigger problem is the fuel tank busting when hit. That is exactly what happened to the last 95 I ran over with my old suburban, gass leaked everwhere from the fuel tank.

The soot trap, it can be argued, Does little to lower emmisions. We all know the mufflerless trucks more fun to drive so one man's noise is another man's pleasure, in that case. As far as the fuel, run it how you want, just be aware of the reason it's there is for the public at large, as well as you and we're all looking to avoid that accident, so, no worries.

QM, my last post was left with this famous quote in mind "Stop critically complaining and lighten up" :funnypost :funnypost :lol: :lol:

That's to remind me to light up. I'm as human as anyone.

LOL I know it and as normal I say things with a smile on my face. I hope you understood that when you read it.
Have a light day

Perfect...

Holy cow. What was this thread about again? Hard starting or environmental and fire hazard concerns? Can we call this one a draw guys? There's obviously several options, and we'll have to leave eachother to our own devices to decide what we'd rather do to our own trucks.

exactlyyyyyyyyyyy TDG