Im planning on adding 1/2" lines and a Hellmann sump in my truck in the near future but i have a few questions since i havent really messed with the fuel system before. I'm assuming guys like BC847 and WannaDiesel and others have done this before so i was hoping this site would be a good place to ask.

1. I wonder about the filter head. Can the stock one be drilled and tapped to accept 1/2" fittings... but if you can would there be any other restriction in it?

2. If question #1's answer is No.... What remote filter head are you guys using?

3. What fittings are you guys using to go into the injection pump. (Im thinking of the ones with the 90* metal hose coming out of it)

4. What fittings will i need for the piston pump? Can they be 1/2" I/D too?

If theres anything else you might want to add please do. The only thing im set on is keeping the Piston Pump i have for now. It keeps my pressure well, i just think the volume is lacking.

 

https://www.dieseltruckresource.com/...d.php?t=151190

Have you checked this one? Hope that gets you started.

 

I actually did scan over that a couple of days ago but didnt pay enough attention to the details.

 

If your pressures are good now, you are not drawing enough fuel to need much more. Fuel is for the most part an uncompressible liquid, so if you have the pressure and it's not dropping, you have enough volume. It's not like a turbo where we have the phenomenon of loosing boost, but gaining volume due to better intercoolers, turbos, etc. If you're sucking your pressure down at WOT however, then bigger lines will help.

I've been told bigger than 3/8" lines isn't really needed, but I might be remembering something incorrectly.

Of course I'm sure your target (like most of us) is heavier mods down the road. So just because you don't need it NOW, doesn't mean you won't later!

 

If your pressure after the filter is good under load, you're not going to improve things by adding more volume.

All the fittings are M12 x 1.5 -> AN or JIC.

The filter will be the main restriction. But if you use a high pressure fuel source and regulate after the filter then it's not hard to maintain post-filter pressure with a stock filter.

 

How about a fuel log? This is one of my spring time projects but maybe you will get the idea... A little extra fuel in a reservoir close to your pump. Its still missing a few things but the line going in the bottom is fuel supply the one on top is return to tank supply still has to be added but will be plummed direct to the pump below.

 

Thanks. I guess what im trying to do is keep pressure as high and stable as i can under all situations. I honestly need a snubber for my fuel pressure gauge before i shoot off my mouth about how good the pressure is but i believe its around 10psi post filter under WOT but its hard to drive WOT and watch a bouncy gauge too.

The thing im more interested in is the sump.... I think the stock pickup tube is a restriction and if i do the sump i figure i might as well do the lines and do them right. If i can get more pressure and volume out of this lift pump that only will leave me the option for more fuel



Isn't that a nice piece^?

 

Wanna... since you use a Walbro pump you may not know if this is correct or not but in page 2 of the link Billut has this quote about the piston lift pump.

"Here are the fittings I used on the LP. I can't remember what size fitting I used to come into the lift pump. It looks like a pipe fitting since I teflon taped it. Sorry, I have racked my brain but I can't remember. The other fitting is the M14 to an 8AN 90*"

My questions are... Does M14 sound right to you? And do you know what size fitting comes into the lift pump?

 

Very true. Another member on here did the exact same fuel set up as mine. Carter 4601HP pump mounted on the frame rail, 3/8" lines, increased pick up tube in the stock pick up basket in the tank.

The only difference is he used a larger filter and went straight to the pump. I used the stock filter (since the lines look to be 10mm which is about the same as 3/8"). He got 15-18psi. I get 9-12psi. Apples to apples except the filter and I have about 33% less pressure.

 

Im bumping this back to the top... Bigger injectors need more fuel.


does anyone know the thread size for the "in" side of a piston lift pump? i think i have everything else i need for the system besides that and i cant find what is it without taking the pump off of my truck but i daily drive it.


Basically i am looking to end up with this... i copied this pic from a post in BC's thread linked above.

 

That's the easy one, stock and low pressure piston lift pump inlet is 1/4npt. IMO if you're just using a low pressure piston LP, I'd only upgrade from the tank to the LP. Then you're not buying a bunch of metric adapters and fittings. Then when you upgrade to a good electric pump you could do the stand alone fuel filter and larger lines to the inlet of the injection pump...

 

What if i could enlarge the fittings in the pump to 1/2 npt? Im not trying to sound like im being hard headed, im just working with very little money. Buying an electric pump would probably get me living in the dog house for a long while.

right now i have a list of 8 fittings, 1 remote filter head, and 20 feet of 1/2" fuel line. I think thats about 100 bucks. That stuff would get me all the way from the tank to the injection pump (minus the sump).

 

I know it to late for you JB but i was at a farm supply today (like every day) and saw a filter with head and some good mounting holes for a log splitter for the hydrolic fluid, for $19.00, i wish i would have seen that before i built my set up.

Dar

 

I actually havent bought anything. When i said i "have" i meant i have the part numbers. I have a part number for a Fleetguard filter head that will let me run the Fleetguard fs1000 filter. I think that head is only like 25 dollars.

 

25.99 is what I paid for mine at cummins. The filters are 22ish dollars there also. They have the JIC fittings in and out.