So I'm working on a WVO conversion, and I ran into an interesting issue after starting the pluming of the second line... NOTE: I have NOT put any WVO in this truck yet! The valves are HydraForce valves, so the IP should be getting enough fuel.

It used to take 2-3 seconds at most to start, now it takes double or triple that. It also pulsates when at idle. It takes a long time to start whether its cold or ran for a bit.

I thought I bled the fuel lines sufficiently. I've been running it like this for a week and its not getting better, so I'm guessing something else is up.

No CEL codes are being thrown either. Fuel filter was replaced last weekend before all this started.

Any ideas?

fill out your profile so we know what mods and after market is on there.

Fuel filter might not be primed enough, also make sure the bleed screw is tight and the o-rings for the filter are seated properly so there is no leaking. That's all I can tell you, I know you're a noob (no offense implied) but work on getting a signature/profile filled out so we can help you to the fullest. Congrats on your first DieselPlace post!

Sounds like air in the system, when my Water in Fuel sensor was leaking my truck would idle poorly.

Dealer replaced the WIF and everything was back to normal.

thanks, I've lurked on here for a while, but never started posting. Filled out vehicle information, as well as a few more observations...

1) its bone stock, no chips or other mods.. at least not until the conversion is done
2) crank-over is getting worse in the morning. It now takes 8-9 seconds before it'll turn over. Last week it was in the 5-6 range
3) once its warm, it takes about 4-6 seconds to crank now. It used to take 1-3seconds

I'm wondering if I should re-prime the fuel line? I would think all the air would be out of the system by now. The return line hasn't been modified and returns to the stock diesel tank. (actually thats another question for another post)

There seems to be little to no power loss when running, but it still pulsates at idle.

Sounds like air in the system, when my Water in Fuel sensor was leaking my truck would idle poorly.

Dealer replaced the WIF and everything was back to normal.

hmm if it was leaking, I should notice fuel dripping from below the filter right? There are two sensors, one on the top, on the filter header mount and one on the bottom. which plugs into the filter itself.

Mine was doing the exact same thing and it was the bleed screw was just barely loose enough that just a tiny puddle would form on the top of the FF housing. Never smelt it or noticed it until it did the hard start/die/surge thing on me.

Figured air in the line, go pump your primer until it is too hard to pump then watch for leaks. I can come from the bleed screw, the WIF sensor or the top O ring seal. It can also come from the fuel lines but unlikely.

Good luck.

Mine was doing the exact same thing and it was the bleed screw was just barely loose enough that just a tiny puddle would form on the top of the FF housing. Never smelt it or noticed it until it did the hard start/die/surge thing on me.

Figured air in the line, go pump your primer until it is too hard to pump then watch for leaks. I can come from the bleed screw, the WIF sensor or the top O ring seal. It can also come from the fuel lines but unlikely.

Good luck.

I made sure that all the sensors were tightly attached, and didn't notice any leaking. However, it looks like the plumbing is to blame. I'll post a full WVO conversion up here when its done, but you can see some of it from this photo:

http://gallery.fcdnet.org/d/127426-2/IMG_1352.jpg

Basically I plummed one of those valves for the source (which is fine), and the other valve for loop. But since I haven't gotten the return line off, I had just plugged the loop line at the valve.

well... there was a nice little air bubble that formed past the T where the source fuel and loop meet up to run into the CP3. So I took off the cap that plugged the end of the new hose, and put my finger on it until it pressurized with diesel fuel. then I let it off slowly, and diesel spewed everywhere... quickly pumped up again to pressurize, and replaced the cap.

Then I went to the fuel pressure valve next to the rail, and pressed on it with a screw driver.. there was so much air that Diesel SPEWED a good 20 feet from the truck! I pressed on it again and just diesel shot out.

Cleaned up the diesel mess and fired her up. Started like a charm and it idles nicely now!

Thanks for the advice!