Is anybody using the stock fuel sending unit /pick up lines for their fitech ? the lines seem a little bit smaller than what is recommended. Thx, Joe
Fitech fuel lines
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I did use the original (well, stock replacement) for the feed on mine. That said, on my drive from San Diego to Austin, the pump was getting loud and warm to the touch at the end of each ~500 mile day. Now, it's been fine around town for the last 2 years, and the inline pump is mounted as close to the tank as possible and right at level with the bottom of the tank. But I do believe it's on it's way out and I plan on re-doing the feed with the recommended larger feed line.
In all, I think it's probably pretty important to run the correct size line. It didn't cause any trouble at all until I made the cross country drive. It made it, and sounds fine when I drive it around but I suspect it adds just enough strain to prematurely kill the pump.
Also of note, I didn't see anywhere in the instructions where it talks about using the PWM feature with FiTech's inline kit, so I had it "off" at 74. When I talked with FiTech's tech support while on my cross country trek, they said you can adjust PWM down to "as LOW as 60" with their pump. The limitation would be making sure you're not going lean on AFR's due to the pump slowing down, but had I known this I believe that would have helped take a lot of strain off the pump as well.
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Just my .02
If you're dealing with a stock-ish engine, and a big 'ole aftermarket pump capable of supporting 600hp, you very likely need to use PWM.
A stock-ish engine will never ever come close to needing what the pump can supply. Pump running 100% all time is likely a recipe for early pump failure.
On the 5/16" line deal, many FI vehicles out there came with them/run them without issue. However if using the big 'ole aftermarket pump, it is probably a good idea to increase to 3/8" especially if they recommend it.
On mine using pumps matched more to engine needs, I've had zero issues with either of my TBI wags. One is 3/8" and in-tank pump, Other is 5/16" external in-line pump.
But, they are OE type pumps capable of supporting stock-ish engines or mildly modified engines. Both setups have many (tens of thousands), trouble free miles on them.
If I was to install say a new FiTech system, I'd upgrade line size, but I would run an OE style stocker pump in the tank.
If FiTech is saying you can get away with dropping it to 60% that tells you a lot about how much it is overkill for the system, and just not needed until you increase HP significantly.
Just my opinion thoughTony
88 GW, 67 J3000, 07 Magnum SRT8
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Originally posted by babywagJust my .02
If you're dealing with a stock-ish engine, and a big 'ole aftermarket pump capable of supporting 600hp, you very likely need to use PWM.
A stock-ish engine will never ever come close to needing what the pump can supply. Pump running 100% all time is likely a recipe for early pump failure.
On the 5/16" line deal, many FI vehicles out there came with them/run them without issue. However if using the big 'ole aftermarket pump, it is probably a good idea to increase to 3/8" especially if they recommend it.
On mine using pumps matched more to engine needs, I've had zero issues with either of my TBI wags. One is 3/8" and in-tank pump, Other is 5/16" external in-line pump.
But, they are OE type pumps capable of supporting stock-ish engines or mildly modified engines. Both setups have many (tens of thousands), trouble free miles on them.
If I was to install say a new FiTech system, I'd upgrade line size, but I would run an OE style stocker pump in the tank.
If FiTech is saying you can get away with dropping it to 60% that tells you a lot about how much it is overkill for the system, and just not needed until you increase HP significantly.
Just my opinion though
What kind of in-tank setup would you use for our stock tanks? I want to go that route if possible if I'm gonna tear into it again.
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I've never messed with a JTruck tank, so hard to say? They're a different animal than the wags/cherokee tanks.
Guessing a GM pump could be stuffed in there without too much trouble though. Something from an LS car or truck maybe?
I like the fact that if I ever did have an issue with either of mine, any parts store likely has the pump on the shelf, or another store close by does.
They're MUCH cheaper than aftermarket too.
My '88 has a GM truck pump stuffed in there, and there are smaller(newer model) units out there.
If I can stuff an LT1 pump assembly in a boat tank lol, I'm sure finding something that'd work in a JTruck tank wouldn't be too bad.
Tony
88 GW, 67 J3000, 07 Magnum SRT8
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regulators set pressure, not the pumps.
something from a later model car/truck w/ v8, and should not be terribly difficult to find & use.
The LT1 pump is compact, it’s 5/16” outlet.
It’s stepped up to 3/8” by larger pickup tube.
Can be had for $16-$70 depending on brand.
Used in ton diff. GM cars & trucks.
Just one example, several others.Tony
88 GW, 67 J3000, 07 Magnum SRT8
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I ended up cutting off the pick up and return tubes on a stock replacement sending unit, drilled out the holes and soldered 3/8 tubing bent 90 deg. to it.1983 Cherokee 4 door
AMC 360 727 trans 229 transfer case
FiTech EFI, MTA-1 cam, wiseco 9.25 pistons
Working on complete restoration with Wagoneer boobie Grill
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Originally posted by Pyrate2010I ended up cutting off the pick up and return tubes on a stock replacement sending unit, drilled out the holes and soldered 3/8 tubing bent 90 deg. to it.Tony
88 GW, 67 J3000, 07 Magnum SRT8
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Yep, I did the same (modified stock sender to hang an EFI pump on it) and no complaints. I let the 5/16 tube stay in place (the old carb's feed line) as a return, unsoldered the 1/4" return, drilled the hole to 3/8 and bent some tubing.
Every V8 with EFI that I'm aware of came with 3/8 feed and 5/16 return. I don't need any other reason to do it that way, too.
When in doubt, imitate the OEMs as best you can.
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