Jerry/MT
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Rick, would it run at all if the transfer pump was bad?
Ford 6610 Hard Starting Issues
- Thread starter mojust84
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Rick, would it run at all if the transfer pump was bad?
Soundguy
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if it's passing fuel it should run.. if it leaks.. it might let it suck air though..
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RickB
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A 6610 would gravity feed fuel to the injection pump and run; maybe not the best with 1/4 tank full. Any Ford with an inline pump/transfer pump arrangement that actually has to 'lift' the fuel won't run well at all if it can't provide positive fuel pressure (4 psi or so) to the injection pump.
Jerry/MT
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I'm surprised that an engine with gravity feed would need a lift pump at all. It must be because of a requirement set by the injection pump.
RickB
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RoosaMaster (Stanadyne) and CAV (Lucas) rotary injector pumps have internal vane style lift pumps built right in. Simms and Minnemec and Bosch inline pumps do not but all require positive pressure to the high pressure pumping elements. Bosch rotary pumps have been built both ways over the years.
That pump will work with gravity feed, but works better with a few psi pressure feeding it. The lift pump is especially needed in other applications, such as the Ford A62 wheel loader, where the fuel tank is under the engine.
As for the starting issue, do all the checks previously mentioned. One last thing I would check is the fuel bleed fitting. There is a plastic tube (1/4") from the injection pump to the top of the injectors (leak off lines). Remove the banjo bolt from the pump. It has an orifice in it that needs to be clear. It can plug up with a little rust or crud. Ford use to recommend enlarging the orifice to help starting, but I can't remember to what size.
As for the starting issue, do all the checks previously mentioned. One last thing I would check is the fuel bleed fitting. There is a plastic tube (1/4") from the injection pump to the top of the injectors (leak off lines). Remove the banjo bolt from the pump. It has an orifice in it that needs to be clear. It can plug up with a little rust or crud. Ford use to recommend enlarging the orifice to help starting, but I can't remember to what size.
OP
mojust84
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Wow thanks again for educating me guys. and a big thanks for the schematic. I will check that orifice and the return lines first thing monday morning.
Sorry i havent responded in a few days, we have been working hard theses past few days and using the tractor quite a bit. im happy to say that i did go back and fix the leaks and the past few mornings shes fired right up.
however i have used it everyday and it has only sit for 10 to 11 hours overnight between starts. i probably wont start it tomorrow so that ought to give it time to "leak down" or lose prime if it is going to i would think.
Also thank you for the explanation on the lift pump. guess it just never dawned on me its real purpose. i thought it was only a primer for cold starts in the winter:laughing:
one question though ...does the lift pump build PSI from the engine running or how does this pump work since it is a gravity fed system? also how often can you expect these to go out?
Sorry i havent responded in a few days, we have been working hard theses past few days and using the tractor quite a bit. im happy to say that i did go back and fix the leaks and the past few mornings shes fired right up.
however i have used it everyday and it has only sit for 10 to 11 hours overnight between starts. i probably wont start it tomorrow so that ought to give it time to "leak down" or lose prime if it is going to i would think.
Also thank you for the explanation on the lift pump. guess it just never dawned on me its real purpose. i thought it was only a primer for cold starts in the winter:laughing:
one question though ...does the lift pump build PSI from the engine running or how does this pump work since it is a gravity fed system? also how often can you expect these to go out?
The lift pump is a diaphragm type, with 2 check valves ( 1 on the inlet, 1 on the outlet). The diaphragm is "pumped" by a cam in the injection pump.
The lifespan of these pumps is not as long as they used to be. The new low sulfur or ultra-low sulfur fuel does a good job of drying out the "rubber" parts of the fuel systems and causing leaks and performance issues.
The lifespan of these pumps is not as long as they used to be. The new low sulfur or ultra-low sulfur fuel does a good job of drying out the "rubber" parts of the fuel systems and causing leaks and performance issues.