Ready for my next mod and need help desiding
#21
09-03-2013, 12:01 PM
too high of fuel pressure to the injection pump will put too much pressure on the diaphragm inside causing hard start situations...vp44 do not like high pressure.
they are designed to start on 7psi and operate on 10psi+ while engine is running
do not run 45psi to a vp44 unless you want an early failure and fuel leaks..
they are designed to start on 7psi and operate on 10psi+ while engine is running
do not run 45psi to a vp44 unless you want an early failure and fuel leaks..
#22
09-03-2013, 12:16 PM
I would never recommend a sump for someone with an in-tank lift pump.
1. they have to drop the tank and unhook that pump anyway.
2. sumps are NOT road legal
3. giant hole in the bottom of the tank.
4. sumps only delay 1/4 tank issues to 1/8th tank. they still suffer from fuel slosh.
draw straw 5 on the other hand.
1. made to retrofit into the in-tank pump canisters
2. 50%-150% cheaper than a sump
3. eliminates 1/4 tank issues completely if return line is located at the canister
4. legal for use on public highways
5. no hole in the tank at all.
I run the modified liberty module in mine which is essentially the same thing..
holds solid pressure with no fluctuations or drops/spikes in pressure even when the fuel empty light is on and the needle is in the red while intentionally trying to make fuel slosh happen... fill up was 34 gallons after the test.
would love to see a sump try that...
blue line with the 08-JIC fittings is the 1/2" draw straw 5, blue line with the QC fitting is the airdog150 return line, and the black QC line is the VP44 return line
start of the test...
1. they have to drop the tank and unhook that pump anyway.
2. sumps are NOT road legal
3. giant hole in the bottom of the tank.
4. sumps only delay 1/4 tank issues to 1/8th tank. they still suffer from fuel slosh.
draw straw 5 on the other hand.
1. made to retrofit into the in-tank pump canisters
2. 50%-150% cheaper than a sump
3. eliminates 1/4 tank issues completely if return line is located at the canister
4. legal for use on public highways
5. no hole in the tank at all.
I run the modified liberty module in mine which is essentially the same thing..
holds solid pressure with no fluctuations or drops/spikes in pressure even when the fuel empty light is on and the needle is in the red while intentionally trying to make fuel slosh happen... fill up was 34 gallons after the test.
would love to see a sump try that...
blue line with the 08-JIC fittings is the 1/2" draw straw 5, blue line with the QC fitting is the airdog150 return line, and the black QC line is the VP44 return line
start of the test...
#23
09-03-2013, 12:23 PM
yep, DOT doesn't want your entire fuel tank dumping on the ground in the event of a leak or fuel line break in a car accident. that is the reason you will NEVER see a sump come factory on a car or truck. only thing I have legally seen them on is motorcycles. but they don't hold much fuel anyway.
#24
09-04-2013, 07:55 AM
#25
09-04-2013, 12:14 PM
according to this they are legal *IF* you have the line/sump below the tank protected from impact. so in other words legal if you have a skid plate. I don't know of a single truck running a sump that has made/installed a skid plate to protect it.
All fuel systems. - Federal Motor Carrier Safety Administration
All fuel systems. - Federal Motor Carrier Safety Administration
