Little-bit

Every time I replace my fuel filter my truck will not restart. I remove the old filter and fill the housing with diesel. I then install the new filter and tighten down. I always cycle the key a few times to allow the LP to fill the remainder of the filter housing. When I crank the truck it will start, run a few seconds, and then die. I try and cycle the key several more times and crank again with no luck. I end up loosening the #1 injector and cranking untill fuel is present. I will then retighten the #1 injector and the truck will crank and run fine. What am I doing wrong?

ds1rider

Bump the starter. This will make thee LP run for half a minute or so. Do this a couple of times.

whiteVLX

Next time loosen the injection pump overflow valve bolt and let the fuel weep into a rag while the pump is running. It works like a charm for me.

hamilton71801

I will bet you 1,000,000,000 dollars that your Lift pump is dead. Mine was doing the same thing and I would have to crack a line to get it run. I finally (after 30,000 miles) decided to check my LP and guess what? It was dead. I put on a new one and viola!!!!! problem fixed. Now I'm just waiting on the injection pump to die since I probably didn't do it any good by starving it.

PS. If you decide to go back with a stock LP, I got mine at Oriellys for @$230 with a lifetime warranty.

P.J

Don't pay $200.00 for a lift pump. You can get one at any Cummins dealer for about $65.00.
p/n 4090046.

Little-bit

I checked the LP last week. It was 10 PSI up to about 2K RPM's.

hamilton71801

Guess I owe you 1,000,000,000. Will you take a check?

volly818

Is'nt there a check valve in the system somewhere? Don't know but it sounds like the fuel is running back out when the filter is changed.

Bill H

I am wondering the same thing with a starting problem...If I hit the starter for just a couple of revolutions about three times the truck will start but if I let it crank, it will never go.

AggieJustin

When you say "cycle the key" are you just turning the key to on and letting the pump run for the second or so, or bumping the starter so that the pump runs for 30-45 seconds. If you're not bumping the starter, you're not getting the system primed the rest of the way. And as soon as you start the truck, you're using up all the fuel between the VP and the filter and then you have to fight to get the air out.

Bump the starter and make sure you can hear the pump picking up fuel (it should sound like it bogs down a little). Another way to check is open the banjo on the VP slightly or press the Schrader to see if you're getting pressure at the VP inlet. When you are, you're primed.

Jdonoghue

Be careful - I didn't know the pump ran longer if you bumped the starter. I've never seen so much diesel fuel spray all over the place

AggieJustin

And once it starts, you can't shut it down (short of pulling the batteries). I've found this out when I discovered my pump flowed more than the capacity of the bottle I was pumping into

ds1rider

But it sure does clean your motor up nice.

ISBpower

there are two cheak valves one kinda behind the fuel filter housing and one on the injection pump i usally crank the engine then open the filter one then when it leaks out fuel i open the injection pump one and my truck usally goes if not i repeat the process.

PChouinard

Cracking the banjo fitting on the Vp always does it for me. I have the wife bump the starter while I lean ofer the grill ready with a socket. As soon as fuel sprays, closer up, start her and run 'er like a rented mule..