Manitou 627 fuel pump

[Cow1]

I serviced my Manitou 627 and changed the fuel filters. After that I couldn't get any fuel up and I found out the lift pump had packed up.

This is the third one I've had now and last time it revealed itself only when changing the filters also. Apparently they still can go on running without it.

I've fitted the new pump and it runs and put pipes on exactly as before. I've then left it to bleed up and I still can't get fuel up but plenty of air getting back into the tank. It has a full tank of fuel.

Any ideas?? It seems air is getting in somewhere but I'm buggered if I can trace where.

 

[carbonfibre farmer]

@ACEngineering

 

[ACEngineering]

I serviced my Manitou 627 and changed the fuel filters. After that I couldn't get any fuel up and I found out the lift pump had packed up.

This is the third one I've had now and last time it revealed itself only when changing the filters also. Apparently they still can go on running without it.

I've fitted the new pump and it runs and put pipes on exactly as before. I've then left it to bleed up and I still can't get fuel up but plenty of air getting back into the tank. It has a full tank of fuel.

Any ideas?? It seems air is getting in somewhere but I'm buggered if I can trace where.

the banjo bolt fittings on the bottom of tanks block easy, later machines don't have banjos anymore but they will still block in the end.

Most common place to suck air in is if you have the sediment fuel filter, looks like a normal CAV or crossland 522 filter but it isn't it has a mesh inside it not a paper filter. the metal braided pipes that go in and out of the sediment filter perish and let air in about 1/2" from the fitting/crimp. leave ignition on with the pump running and then lift the pipe were it bends down straight after it comes in or out of the filter you will hear the pump change tune normally.

Are you fitting genuine perkins pump? there are after market ones about but they are the old design and are rubbish. Perkins introduced a new version about 2 years ago? it has a round circlip holding the pump in the filter head, and it has the electrical connection plug vertically not horizontal, plus it comes with a new 4" wiring loom as an extension lead in case the vertical plug needs a longer wire depending on application. Some dealers and suppliers will no doubt have had old stock to get rid off before selling the new style but I would have thought old stock would have disappeared by now?

 

[ACEngineering]

I note you say changed fuel filters! so you do have the sediment filter but are you fitting a cheap paper filter instead of the mesh one which is about £11ish. these is little point in replacing the mesh filter they rarely block and can be washed out. (vapormatic version is not a mesh so cant be washed its a course paper material of some sort)

having a paper filter in there will make it harder work for the elecy pump to suck the fuel though

 

[Cow1]

Thanks ACEngineering for your help. The problem has been sorted. As you suspected it was pulling air. The seal wasn't flush on the glass on the pre filter. I have fitted a non genuine old style pump as that's all I could get hold of yesterday afternoon but I will bear in mind your comments about the new Perkins one for next time.

 

[ACEngineering]

Thanks ACEngineering for your help. The problem has been sorted. As you suspected it was pulling air. The seal wasn't flush on the glass on the pre filter. I have fitted a non genuine old style pump as that's all I could get hold of yesterday afternoon but I will bear in mind your comments about the new Perkins one for next time.

No worries I have yet to have the one of the new style pumps fail so hopefully they are sorted as it was a bit of a joke before.