Shimming Question

[roosterdiesel]

Just got back a little bit ago from the mod party. Team_penin and Tx_atty are a couple of good guys that bleed diesel!

On Team_penin's truck we had a baseline of 55-56psi. Put for 4 #4 washers in and it came up to 60, put in 2 more and it went down to around 59. He didn't want to put in another since we didn't gain much.

What did I do wrong guys? This is the first time for me to use washers as shims since I have a DI regulator housing kit. Please educate me. I left my gauge setup on his truck so he could watch if it comes up after working out any air.

Mod party was about 50% productive. Lots of BS'n and other things. Tx_Atty's cab lights look good! I think I'm gettin' some.

 

[Tail_Gunner]

You might have a fuel pump on it's way out.

Mine did the same thing. Put a fuel pressure gauge on and saw how weak the thing was while going down the road or with the "go-pedal" mashed. The pump couldn't supply the needed volume at the needed pressure. It was so weak, all the shimming in the world wouldn't bring the pressure up.
You may be in the same boat.

I didn't really have a decent pre-pump filter, which probably didn't help. It was just a "strainer" which kept solids from the pump. I changed that and now have a REAL FUEL FILTER/WATER SEPARATER. I felt it was prudent to better protect my shiney new fuel pump. Those things ain't real cheap.

 

[roosterdiesel]

That's what I told him. I think his truck has 85K on it. I also suggested a fuel filter change.

I know my pump is going now with 108k. Dahl's on the way before the fuel pump too.

 

[95_stroker]

Did you by chance take a screwdriver and tap on the FPR housing when you started to get the funky numbers?

 

[roosterdiesel]

No tapping on anything except the throttle a little. It would drop to 50 in his 120 DP tuner program.

 

[95_stroker]

Ahh, it was just a passing thought anyway Antonio, regulators can be a bit fickle as it is. I have yet to see any regulator, be it air,water, oil, fuel come back to the same resting position twice in a row.

 

[Blowby]

It would drop to 50 in his 120 DP tuner program

Sure sign of a weak pump. Mine would drop to 52 psi on the dyno with a hot program. Set at 70 psi before the run and read 70psi after the run. Replaced with an SX and I set it to 60psi and it doesn't move.

 

[team_penin]

I have been looking at the different fuel systems on supporting vendors sites, I may have to go with one of them. Which one would you guys suggest?

 

[roosterdiesel]

Sure sign of a weak pump. Mine would drop to 52 psi on the dyno with a hot program. Set at 70 psi before the run and read 70psi after the run. Replaced with an SX and I set it to 60psi and it doesn't move.

Mike O?

Welcome to SDD!

Can I get that address?

 

[roosterdiesel]

I have been looking at the different fuel systems on supporting vendors sites, I may have to go with one of them. Which one would you guys suggest?

Diesel Innovations has the Essex, ITP has a system using an Aeromotive pump and Dieselsite's system uses an Aeromotive pump too.