Been noticing a change in the sound of my truck the last month or so but still working the same, no smoke, no hard starts  etc. Tonight I got dead pedal about 5-6 times when towing my trailer. Did the odmometer read and its showing the 216 code which I know what it means. My question is this..each time I got dead pedal I looked and I'm still holding 17-19 psi with no drop. Only drop I see in pressure is now at an idle im at 12-13 instead of the usual 16psi. Is dead pedal normal when holding good psi? Calling around about pumps tomorrow unfortunatley

i remember at one time a big discussion on here about to much lift pump pressure causing VP issues, i think it was stated that 20-21psi was max.  maybe someone else will chime in that know about this

I've read some posts regarding that also, but personally dont think its an issue of having to high of pressure from what Ive read. Could be wrong

Edited June 10, 20159 yr by dobienut

My fuel pressure at 65 mph is 23 pounds and I have had no problems to date. 

If your truly worried about your fuel pressure it may be wise to verify that your readings are accurate.  It is odd that your pressure has so much fluctuation from idle to cruising down the highway.  My fuel boss pressure doesn't change, pretty solid.  Though, I wouldn't suspect that that would cause IP issues.

P0216 code is not a exactly a fuel pressure problem but fuel lubrcity problem. The timing piston has seized and no longer responding in a timely manner. As suggested I wouldn't go over 20 PSI there is no need for that much pressure. As for my setup I'm idling at 17 PSI and WOT I fall to 15 PSI even with a 9 year old AirDog 150.

how many miles on VP?

Sounds like the VP is getting pretty tired. Keep the lift pump pressure up and use 2 stroke to keep the fuel lubed and you should be good to go. I recommend industrial injection for a rebuilt pump.

Doesn't the relief valve (return fuel system) take care of too much pressure? I'm 22 idle and around 18 cruising down the hiway. Never falls below 14.

My fuel boss has no issues keeping rock solid pressure. If you are having that big of a drop at idle I would get on the horn with Rich at Glacier. You may have a regulator issue of some sort. Might also want to peek at your filter and make sure it's not fouled.

pressure isn't an issue driving along or at idle. I only mentioned how I now hold 12-13 psi at idle because I now know somehting has happended to the injection pump vrs before. I was just wondering if its normal to experience dead pedal and still hold good fuel pressure when driving along. As Michael said, the 216 code is telling me the pump is most likely bad. I always run 2 stroke in it also.  Ive been calling around all day about a pump, including the place someone mentioned above, sad part is shipping and duties make is not worth buying from away.

Ok. Still might be wise to check the filter depending on where you are getting your readings. If it's before the filter (and the filter happened to be an issue) it would seem you would not register a drop in pressure before the filter if it was the bottleneck but could potentially be starving for fuel on the other side of the filter under load. Probably not the issue but easy enough to check,before looking at more expensive stuff.

Thanks for the replies..brand new filter in it about 300 miles ago.  As for Pumps..anyone running a VP from BD  diesel performance?  Opinions ?

If at all possible, it would be best to support a vendor here on the site. Again I'll suggest going with an industrial injection from one of them. I haven't heard of any problems with them.

You could also switch to a SO pump if you're going to be looking for more power down the road.

Doesn't the relief valve (return fuel system) take care of too much pressure? I'm 22 idle and around 18 cruising down the hiway. Never falls below 14.

 

Only to a point... The supply is on the right and the return is on the left. So how much volume do you think you can return though such a small hole?

Only to a point... The supply is on the right and the return is on the left. So how much volume do you think you can return though such a small hole?

Well that depends on the velocity through that small hole. If the fuel can move quickly a high volume can go through it.

True but you have to increase pressure to increase volume. At what point do you risk blowing the front seal out? This is unknown but I've seen seal blow out as low as 25 PSI and I've seen people claim that the VP44 can hold 40-45 PSI without blowing out.

mine has seen 35+psi a couple times thanks to my old raptor going nuts.

Sounds like the VP is getting pretty tired. Keep the lift pump pressure up and use 2 stroke to keep the fuel lubed and you should be good to go. I recommend industrial injection for a rebuilt pump.

I ran out of 2 stoke oil this week so I only put 10 gallons in, had to do this twice. I picked up some 2 stroke at Walmart, 2 pint size bottles, 16oz each costs $2.43 per pint bottle or for the same brand, Super Tech, price per gallon is $12.15. I ran 2 tanks of 10 gallons each with no 2 cycle oil. My engine was louder and the performance down a little. I added about 6 ozs and cranked up. It didn't take long to hear the difference and feel the difference while driving. I don't know how many brand of diesels, Ford, GM, CR Cummins and so forth you can use 2 cycle in the fuel but I am a believer now and will continue to use it in any application that it will work with. One of the best keep secrets I ever learned.

Doesn't the relief valve (return fuel system) take care of too much pressure? I'm 22 idle and around 18 cruising down the hiway. Never falls below 14.

Here goes another stupid question. Why can't you install a relief valve that required way less pressure to cool the VP44? Wouldn't a constant flow of 5psi to 7psi that was returning to the tank work just as good as the 14 psi relief valve being used today?

I ran out of 2 stoke oil this week so I only put 10 gallons in, had to do this twice. I picked up some 2 stroke at Walmart, 2 pint size bottles, 16oz each costs $2.43 per pint bottle or for the same brand, Super Tech, price per gallon is $12.15. I ran 2 tanks of 10 gallons each with no 2 cycle oil. My engine was louder and the performance down a little. I added about 6 ozs and cranked up. It didn't take long to hear the difference and feel the difference while driving. I don't know how many brand of diesels, Ford, GM, CR Cummins and so forth you can use 2 cycle in the fuel but I am a believer now and will continue to use it in any application that it will work with. One of the best keep secrets I ever learned.

I learned from Mopar1973Man. My VP has only gone 1/2 of a tank without 2 stroke and that's beause I needed clean fuel in it for industrial injection to test the pump. It will never go without again!

 

Here goes another stupid question. Why can't you install a relief valve that required way less pressure to cool the VP44? Wouldn't a constant flow of 5psi to 7psi that was returning to the tank work just as good as the 14 psi relief valve being used today?

If you don't have enough pressure built up, then when there is an instantaneous high demand for fuel there won't be enough pressure to compensate and it could starve the pump. It's interesting how pressure / volume / velocity all work together to give a gph output.