my mock-up CTD 24-01 had a schrader valve on the suction side of the fuel filter canster plus one on the injection pump. Sometimes its hard to say exactly what dodge does as each engine has a seems to have a few different variables.

 

Jason,

Sorry if I missed it but what exactly are your fuel pressure gauge readings?

How low is low?!! That may help figure out what your issue is...

...Joe

 

well the mitusa is regulated at 16 psi.

i emailed opie to see what numbers i should be after i saw what my readings were - he said i should see a constant 15-17 from idle to wot

i am seeing 12-13 at idle, 7-8 at wot, and 11 cruising

i told opie this and he said something is wrong - whether it's the regulator or the gauge, or the sender - we don't know but i will be troubleshooting shortly.

 

Its not bad but border line, have you tapped the pump? You could dump the stock fuel filter and just go to the injection pump. You'll probably gain 3-5 psi at WOT, depending on power level. With a 3 mircon filter, you don't need it. That stock 400watt fuel heater helps the cold starts some.

 

i am not going to remove the canister. the heater will be nice in the winter for cold starts.
the pump is NOT tapped.
i am going to keep the stock filter as a backup just in case something goes wrong upstream of the filter.
opie has plenty of guys running with the stock filter in place with zero problems and able to maintain 15-17 psi. i am not worried about it at all.

 

New filter? Still running banjo connections, or is it all the 90 degree push lock stuff?

 

yes, new filter.

the only banjo's in the system are the inlet and outlet on the vp44, as well as the outlet on the bottom of the canister. the pressure is read from the inlet side on the vp44 with the tapped banjo and larger than stock banjo holes.

i have an extra 90 pushlock, and over 2' of hose left. i am going to pick up another 90 pushlock (which is drillable/tappable) as well as two metric 12mm to jic 6 adapters and then run the 'big line' kit from the canister to the vp. i will take the reading from the bottom of the canister so i can eliminate the pulsations from the vp44.

if i could make one complaint about the mitusa kit it is that there is no fittings/plumbing to run the new hose between the canister and the vp44. i'm sure he is correct in that it is not needed and it is just extra work, but for me it will give peace of mind discarding the banjo's, and then i'll have a better port to measure my fp . . .

 

all right, so I just ordered the fittings from Vulcan Performance to complete my 'filter housing to injection pump big line kit'

i ordered this tapped 90 pushlock and the banjo adapters.

the reason for this:
With my current setup, the fuel pressure gauge reading from the VP44 inlet, tapped straight off the banjo, I'm thinking it is possibly causing a venturi effect and might actually be sucking diesel from the gauge tubing and flowing it into the pump. By installing that tapped 90 fitting on the bottom of the canister I will have direct flow straight into the gauge tubing as opposed to having fuel 'flow by' the tubing . . .

Do you follow me on this, or did I just sound jumbled and confused?
Do you think this could possibly be the reason I am seeing lower than expected pressures - if so, do you think running the new line setup would work?

I realize this may not change the actual 'pressure' rather, i am thinking by doing this it will 'read' properly.

 

Have you measured the fuel pressure at the discharge side of the mitusa pump. You should be able to rig up a line for your mechanical gauge. Just put a tee in. Hopefully you have extra hose left over. Just think of the fun your gonna have. I must have dropped my fuel tank now ten times. I got to the point I could drop the tank, remove the pick-up unit, and reinstall everything in 1/2hour. Just the tank had to have 1/8 level of fuel inside. I've had a few bad tanks of fuel from all my travelling.

 

the pressure is being measured from the discharge side of the pump. that is where the reading came from.
or do you mean directly off the pump prior to passing thru anything else? the pump without a regulator will apparently put out 100 psi.

yes, i do have some hose left over and i will be piecing together a big line kit from the canister to the vp44 and will have a different port other than the vp to measure fp.