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Bleeding a Ford CAV fuel pump?

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Author  [Modern View]

01-11-2018 07:13:07

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This on a friend's industrial loader tractor...not certain of the model #. Has a three cylinder engine with the CAV rotary pump...gravity flow fuel system.

The friend had twisted off the end of the throttle shaft in the top-cover. He had bought new parts from a fuel pump repair company...and I put it together for him...new throttle shaft and throttle shaft/kill shaft o"rings and gasket. All went together fine and I've done a bunch of CAV top cover reseals on various tractors over the years....Fords Massy and Deere. I've always had trouble getting the gravity fed Fords bled and running again!...Not so much trouble with the others which usually have a primer pump.

I ran out of time yesterday with the little industrial Ford...I got it reassembled and new filter installed and bled. I'll have to go back in a day or so and bleed the pump. Anybody have advice to bleed the Ford CAV fuel system??

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01-12-2018 06:01:24

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 Re: Bleeding a Ford CAV fuel pump? in reply to Ragnarok, 01-11-2018 07:13:07  
Quoting Removed, click Modern View to see

Yep...I got sent out on a service call to fix a non-running MF860 combine....860 owner had changed fuel filters...ws getting fuel to the twin filters...but no fuel out of the filters?

It boiled down to he left the packings in the filter base(didn't know they were there I guess)..put packings on top of filters and tightened it down...SHAZZAM!! No fuel because the packings sit on top the flow slots around the edge of the filters

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01-12-2018 05:51:54

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 Re: Bleeding a Ford CAV fuel pump? in reply to Ragnarok, 01-11-2018 07:13:07  
Yeh...those pics are exactly what I got...only yellow and with a heavy duty yellow loader frame in the way.

I did change the fuel filter and bleed the bleeder-screw

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01-12-2018 03:34:50

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 Re: Bleeding a Ford CAV fuel pump? in reply to Ragnarok, 01-11-2018 07:13:07  

These pictures are of a 5610 fuel system. Make sure the tank is almost full for the best results. I bleed the fuel filter first. Then I bleed the "bleed screw" on the pump. Due to having a FEL, I bleed the injector lines on the rear end of the pump. Bleed the ones on top.

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01-11-2018 11:39:17

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 Re: Bleeding a Ford CAV fuel pump? in reply to Ragnarok, 01-11-2018 07:13:07  
Thanks for the advice
My friends little industrial Ford is likely about the same as a Ford 3000 or 3600.
It was warm yesterday when I worked on the tractor...but it ain't warm today in Oklahoma!

I've always bled the filters and fuel line to the pump on these and then pressured the tank with air while cranking until it starts.
I think this little tractor had lost it's prime some time back as it's been sitting for several months. I cracked a fuel line and it's putting out a small bit of fuel but not enough. I really didn't try too hard to start it as the battery wasn't charged-up.

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01-11-2018 14:31:33

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 Re: Bleeding a Ford CAV fuel pump? in reply to Ragnarok, 01-11-2018 11:39:17  
ROD has the procedure down cold..
1 thing to add tho.. When changing the fuel filter, the type that has the long thru bolt.. MAKE SURE to put the big oring UP IN the filter head, NOT ON the filter.
Rotsa Ruck..

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01-11-2018 15:03:45

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 Re: Bleeding a Ford CAV fuel pump? in reply to thepumpguysc, 01-11-2018 14:31:33  

This may help..

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01-11-2018 10:41:31

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 Re: Bleeding a Ford CAV fuel pump? in reply to Ragnarok, 01-11-2018 07:13:07  
You've worked on these pumps and you can't bleed them??

First rule with these things is fill the fuel tank. Bleed the filter head. Then open the body bleeder on the pump and crank the engine until it shoots fuel free and clear, then close that up. Then open all 3 lines at the injectors, set it at full throttle and crank. IT should put fuel up in 30 seconds or so. Once 1-2 of them are putting good fuel up it should start when you close them up.


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MJ in the UK

01-11-2018 08:39:58

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 Re: Bleeding a Ford CAV fuel pump? in reply to Ragnarok, 01-11-2018 07:13:07  
I was shown this method by a ford tractor mechanic. Undo the bleed screw on the filter then take off the rubber fuel return line to the top of the fuel tank and pressurise the fuel tank and this should get you bled up to start the engine.
you may have to also slacken the bleed screw on the injection pump then slacken an injector pipe to get all the air out when you crank the engine.

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