Fuel return to tanks - TheDieselGarage.com
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post #1 of 17 (permalink) Old 12-13-2009, 02:35 PM Thread Starter
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Fuel return to tanks

I have no issues, just curious. How much fuel in GPH does a mechanical cat return to the tank, as compared to a C15 and an Acert


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post #2 of 17 (permalink) Old 12-13-2009, 03:04 PM
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Quote:
Originally Posted by flips View Post
I have no issues, just curious. How much fuel in GPH does a mechanical cat return (20GPH+/-) to the tank, as compared to a C15 and an Acert (Both 80GPH++)

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post #3 of 17 (permalink) Old 12-13-2009, 03:55 PM
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That explains why my fuel tanks are always warm.
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post #4 of 17 (permalink) Old 12-13-2009, 04:05 PM
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good question flips,i been wonderin that to.i figured the new ones returned alot more but wow thats alot.
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post #5 of 17 (permalink) Old 12-13-2009, 04:30 PM
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Which explains why newer engines are not as prone to jelling in the winter months as the old..
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post #6 of 17 (permalink) Old 12-13-2009, 04:49 PM
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Quote:
Originally Posted by CumminsISXpower View Post
Which explains why newer engines are not as prone to jelling in the winter months as the old..
As long as the fuel pressure stays up. Shimming the pump spring has helped a LOT. 102 now, vs 90 makes a difference. So far so good at -4*. Virtually NEVER been an issue on the old E7 and EM6 Mack engines we have. Once or twice maybe. Last winter was hell with my C15. Had to run a LOT of Howes. Had to use a gallon every time I fueled up, and put in 175 gallons (and running a pair of 135 gal tanks).

How many gph on a ISX? The fuel pressure is ~290, IIRC?

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Last edited by bmoeller; 12-13-2009 at 04:54 PM.
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post #7 of 17 (permalink) Old 12-13-2009, 09:30 PM
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65++GPH,so plenty to heat the tanks if it has been running long enough,dont here of too many problems,if ya do here about them its a careless mistake. Make sure that the lift pump is strong,and that the psi reg/drainback valves are clean of debri 25psi and 320psi/also im sure somebody has hacked it off by now but the fuel inlet screen.Oh fuel psi specs.........it take at least a 100psi IFSM rail to fire idle is 225 to 290 psi...
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post #8 of 17 (permalink) Old 12-15-2009, 03:49 AM
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Never had the ISX gel yet. The PSI on ours is a very steady 290. Only time it isn't, it's needing a new fuel filter.

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'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


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post #9 of 17 (permalink) Old 12-15-2009, 04:08 AM
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Je travaille sur peu de générateurs avec le moteur de taille simauir comme vous décrivez ici.,
Le système mech pour la classe de 14 à 16 litres le retour de carburant note typiquement environ 80 litres par heure.

Pour verison électronique ils vont beaucoup plus haut flowage ils useally exécuté à environ 300 ou plus litres par heure.

Donc vous pouvez voir grand diffrence et vous ferez a remarqué que les réservoirs à carburant sont chauds de cela.


I work on few generators with simauir size engine as you describe here.,

The mech system for 14 to 16 liter class the fuel return rate typically about 80 liter per hour

For electronic verison they go much higher flowage they useally run in about 300 or more liter per hour.

So you can see the big diffrence and you will noticed the fuel tanks are warm from that.


Merci,Marc

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post #10 of 17 (permalink) Old 12-20-2009, 03:47 AM
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Please pardon the hijack, but would like to put a couple of questions out that are along the same topic;

(1) What would be the minimum size fuel line to use on a C 15?

(2) Best location for a fuel cooler?
Would like to install a one on my truck, I understand that some Petes have coolers under the sleeper, using the return line; I have seen some industrial engines (I THINK the model #s were 3542?, looked very similar to a C 15), powering generators, brand new @ local Cat dealer- these had a cooler mounted on the radiator brace, almost sure they used the supply line somewhere between filters and supply pump. (Meant to go back and study them in more detail, but never did).
I was given a hydraulic oil cooler approx. 15"x18", inlet & outlet look to be at least 3/4", thinking of mounting it either in front of radiator, or under sleeper.
Live in Louisiana, but do run northern states, so would I need to disable it during the winter months?

(3) Quite a few truck O/O in my area have been replacing the stock fuel / water separator with Cat # 8H-7204 (called a primary filter group). It is a canister type filter housing, with a permanent screen inside, unscrewing the large bolt on top lets you access the screen for cleaning. Supposedly this is not as restrictive as the stock spin on separator (Cat #2568753). After ordering one, I was concerned to see that the inlet and outlet was 3/8" NPT; Fellows already using this gizmo said to simply drill & tap out to 1/2" NPT, (looks easily done).
Due to it's compact size, and lack of petcock at the bottom, has me wondering if:
(A) Is it really a water trap?
(B) After opening the line size to 1/2"NPT, will it actually be less restrictive than the stocker?
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