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Old 01-10-2020, 11:18 PM   #1
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Aux fuel pump

I am considering adding a auxiliary fuel pump, CAT kit 206-5756.

The premise of doing this is the fuel tank is at the end or beyond the designed distance of the standard engine pump and any lack of fuel will rob the engine of power.

The engine pump is built into the HUEI pump mounted on the engine. It sucks fuel from the tank. Most cars have a pump in the tank.

This kit is a OEM pump made for the engine that has a better ability to suck up fuel.

I am not sure I have a performance issue other that my scanguageD only shows 330hp on my 400hp engine.

So for the $600 it costs for the parts, is it worth it?

Has anyone else installed this kit or had fuel starvation issues fixed by an extra pump?
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Old 01-11-2020, 08:07 AM   #2
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I understand your thinking on needing a booster pump in the fuel system here are my two cents worth.

Cat and Freightliner have a bunch of engineers that designed the system and said it will work

Youíre driving at 2007 model that has been working fine.

Iím not sure how much faith I would have in precision numbers from scan gauge itís my opinion those arenít really hard numbers as far as horsepower theyíre just calculated

Have you noticed a drop in performance?

On a positive note I do agree 100% that a booster pump would sure make life easier when changing fuel filters. having that ability to pressurize and purge the air out of the fuel system
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Old 01-12-2020, 10:37 AM   #3
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I have a 2006 Cat C-9 tuned to 400 hp. I installed the Cat aux. fuel pump to alleviate a low rpm stumble problem. It solved my problem. It also improved my mpg of fuel usage (not much, but a little). It was a bit expensive, but I am happy with the result. There is a parts list and explanation of installation on the technical forum of the Beaver Ambassador Club. I would probably not do this modification unless you are having specific problems as I was.


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Old 01-12-2020, 11:14 PM   #4
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Easiest way to know if you need it, to put a fuel pressure gauge on your fuel filter. See what your fuel pressure is, then take your coach for a drive. You need to be able to put on a full throttle load for 2-3 minutes continuous. If your fuel pressure drops then a booster pump would help.
Unfortunately I have several applications including rvs that were not built to the Caterpillar engineering specifications. Even Caterpillar heavy equipment.
My Fleetwood Bounder diesel was not built to CAT recommendations.
As far as if its been running since XXXX year so its OK. Not so. The Rubber fuel lines on a rv are under a high vacuum, to pull the fuel from the fuel tank behind the front wheels all the way to the rear for the engine. With the high vacuum and the heat the Rubber center of the hose will start to collapse inward restricting the hose. Its actually fairly comon. Safe Travels
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Old 01-18-2020, 11:46 PM   #5
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Quote:
Originally Posted by Cat View Post
Easiest way to know if you need it, to put a fuel pressure gauge on your fuel filter. See what your fuel pressure is, then take your coach for a drive. You need to be able to put on a full throttle load for 2-3 minutes continuous. If your fuel pressure drops then a booster pump would help.
Unfortunately I have several applications including rvs that were not built to the Caterpillar engineering specifications. Even Caterpillar heavy equipment.
My Fleetwood Bounder diesel was not built to CAT recommendations.
As far as if its been running since XXXX year so its OK. Not so. The Rubber fuel lines on a rv are under a high vacuum, to pull the fuel from the fuel tank behind the front wheels all the way to the rear for the engine. With the high vacuum and the heat the Rubber center of the hose will start to collapse inward restricting the hose. Its actually fairly comon. Safe Travels

Just wondering,
How do you get PRESSURE on a pressure gauge, at the filter of a single filter C-7 engine that doesn't have a fuel pump in the tank? It seems all you have is suction, all the way from the tank to the HEUI pump. Or, am I missing something here?
Scott
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Old 01-19-2020, 01:11 AM   #6
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Originally Posted by FIRE UP View Post
Just wondering,
How do you get PRESSURE on a pressure gauge, at the filter of a single filter C-7 engine that doesn't have a fuel pump in the tank? It seems all you have is suction, all the way from the tank to the HEUI pump. Or, am I missing something here?
Scott
The secondary 2/4 micron fuel filter on the CAT engine is pressurized. The transfer/lift pump is mounted to the rear of the HEUI pump.The primary/water separator filter most likely will be suction, its possible this one is also pressurized but most are not. Safe travels
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