Engine/Transmission (1998.5 - 2002) need advise!!

[duckcarvr]

I bought this o2 about 5 months ago and began reading TDR. in learning of the LP problem i had a 5 psi led light installed. when started the first time the light went out but came on after a minute of idle. we repeated this three times, same results. i parked it until i got a BD pusher pump put on the rail in front of tank. the BD is activated by oil pressure so when started the 5 psi light stays on till oil pressure comes up to about 30 Psi. i like the thought of two pumps so i will have the stock pump replaced. as of late the BD pusher varies in sound at idle. not like off and on but in intensity or varying speeds. Q: is this pump slowing down , speeding up because it is regulated by pressure?. Or do i have a problem. i do not remember this before. 2nd Q: do i need to be concerned about the short time the led light is on at idle. should i replace the stock lp right away. i keyed no codes. i will be putting on a fuel gauge in a few weeks to keep me from getting any more grey hair!! thanks in advance. robert

 

[Beast2B]

it shouldn't take more than a couple seconds for the engine to reach 30+ psi oil pressure.

the only time I notice that variation in the second lift pump's sound is when the heater grid is cycling (colder weather starts).

 

[Joe Mc]

I think with the set up you have you should be fine. However, do you get fuel pressure upon ignition on and wait to start? With the oil pressure switch you are referring to I doubit it unless there's a relay of sorts some how in the system to allow poer to the pump during wait to start cycle. Why the oil pressure switch anyway? I don't see the need? When you key to on, power goes to relay for a time of usually 5 - 10 seconds just to make sure there's a bit of a head to the VP then the wait to start light goes out (depending on how long the grids are on) and you start then the power goes to the LP constant - still trying to figure out the oil pressure switch to activate the LP deal. Not condeming it just don't see the real purpose of it?



Joe

 

[BWagnaar]

On my 67 dart i have a holley Black pump ( 14psi 140 gph) and its constantly changing noises. So as to your Q about it going bad, i don't think so. The flow and resistance in line is changing a little bit and so the pump has to work harder or less depending, which causes the diff noise.



I have an Autometer fuel gauge insted of the light because i wanted to see exactly what the LP was doing, i would recommend the same because it just seems light the light is just too vague. But dont do what i did and run the line to the banjo bolt at the VP-44 because the Vp will kick back fuel pressure spikes of up to 100psi and blow the guts of the gauge. I'm on my 4th gauge before Autometer and I found that its better to run it to the outlet line of the lift pump to the injector pump. I would put a mechanical gauge on and check to see what psi you have when you turn the key on, start it and under WOT or heavy load. Do you hear the stock LP coming? I think in 02 they changed the run time of the LP before start up to about 1-2 second (insted or 3-6 on the prior years). If you dont hear that pump kick on then you should definitly replace the stock LP. BDs pump is more of a back up pump insted of a "replacement" pump. The light might be staying on because the BD (Carter) pump has to push past the stock lift pump.

If you do hear the pump kick on then try replaceing the fuel filter. A buddy of mine bought an 92 Cummins for cheap becuase it didn't run good, he checked the fuel filter and found it clogged. He cleaned it out and the truck ran fine!!



And the oil pressure switch is not a bad idea if you live in really hot places. I guess these trucks will have a hard starting problem if its really hot ( like a vapor lock on gas cars) and too much fuel is being forced to it. The oil pressure swith just kicks the BD pump on once the truck is running so that does'nt happen.



But make sure that lift pump is working and you got good psi cause that VP-44 is not cheap



... just my 2-cents

 

[duckcarvr]

thanks gentlemen for responding. i do not hear well so i don't know if the stock pump is coming on or not [ thats why i got an 02 so i could hear it ] lol the truck starts immediately and runs well. but i will get a new lift pump and gauge soon. but your coments relieved my fears. thanks again robert

 

[mhenon]

thanks gentlemen for responding. i do not hear well so i don't know if the stock pump is coming on or not [ thats why i got an 02 so i could hear it ] lol the truck starts immediately and runs well. but i will get a new lift pump and gauge soon. but your coments relieved my fears. thanks again robert

Get the gauge for sure. Anything with a VP44 should have a fuel pressure gauge.

I also don't see the need for the oil pressure switch. Run the connector to a relay and then straight off the battery. I don't trust the power from the ECU so mine now runs off a relay.

Mike

 

[duckcarvr]

i got the fuel pressure gauge on and have o #s fuel pressure till the truck starts and oil pressure comes up to 30#s. then i have 24 at idle and 14 wot. my question now is if i put on a stock pump on what effect will this have on my overall fuel pressure. will it go higher? i think 24 is high is it not? robert

 

[Joe Mc]

Robert. MHO-The wires going to your oil pressure switch - take them off and connect together - you will see pressure when you key on for 5-10 seconds and when you "jog" to start and release for about 45 seconds. If you are married to the BD pump that is fine, however, I recall reading here that the VPs don't appreciate anything over 22#. So possible way to reduce is a pressure regulator, to reduce to 18# or so. But, the BD pump may not appreciate being all reved up and not being able to discharge the usual rate and could run hot, not sure. I'm sure other vendors may have a pump discharge side relief pressure regulating device (my wording - not sure of the technical name) however I couldn't begin to guess who - don't loose me here - click on this http://www.glacierdieselpower.com/product.asp?pf_id=3919852 and look at the bottom right of the picture for a black tube with a small stem coming out of it's left side - then go to the center and find the brass device to the right of the two big hose clamps. These two devices are: Brass gizmo=pressure reducer & Black thingy=return to tank manifold. It works and here's how (sorry this is getting long). The line leaving the LP has a Tee installed giving it two outlets, one runs to the VP and the other goes to the pressure reducer, the pressure reduce outlet goes to the small tube on the return manifold, the return manifold is installed in the hose from the tank fill 'cap to top of tank line rubber hose'.



Hope that's clear? What happens with this system is; the fuel leaves the LP at whatever pressure, before it reaches the VP pressure is releived and this fuel being releived is returned to the tank. So the LP runs however it needs to and will not get hot due to no flow. As the VP needs more fuel the pressure relief self adjusts to reduce releif and maintain constant discharge volume & pressure.



I'm sorry if this was long, and I hope I'm making it clear how the two devices work? Just call Rich @ Glacier and he will help you out / suggest what you need. I have 18-19# idle and never see below 16# even @ WOT w/comp on 5/5.



It is MHO that the oil pressure switch was meant to be an engine "cut off" switch upon loss of oil pressure. Or in a commercial generator application it would be a coolant heater cut off upon 30# oil pressure to turn coolant warmer off during testing/running.



Later on good luck - hope my rambling helped somewhat. :-laf

 

[SnoKing]

BD pusher varies in sound at idle. not like off and on but in intensity or varying speeds. Q: is this pump slowing down , speeding up because it is regulated by pressure?. Or do i have a problem. i do not remember this before. robert

Most likely it is because of the grid heaters cycling and drawing the voltage down. SNOKING

 

[duckcarvr]

Thanks to all that responded. i will rewire my pump and put the pressure relief valve on... . after all its what ever my baby needs!!! thanks again and have a merry Christmas robert

 

[Lonestar]

The pressure relief switch is used on the BD kit to eliminate a HOT start condition as mentioned before. Just because you don't understand the means by which the BD system works doesn't make it any better or worse than the GDP kit.