Author Topic: Fuel Pump Install  (Read 3807 times)

Offline jsfnq

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Fuel Pump Install
« on: October 18, 2016, 08:59:41 AM »
Fuel pump was leaking oil from the engine block. I removed & replaced Gaskets.  I Can not get  the petrol to draw. the diaphrapm is operating with manual lever & there is a  slight suction on the fule line. Pumping with manual lever will not draw fuel.  No visible obstructions or leaks on fuel lines.

As it was working prior to gasket replacement I assume I have erred somehow when reinstalling.

Any ideas?




Offline Chazza

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Re: Fuel Pump Install
« Reply #1 on: October 18, 2016, 09:34:19 AM »
There should be a very definite suction on the inlet side, when you have the pump in your hand and you are moving the lever.

Are you sure that the lever is sitting on top of the camshaft not underneath it?

If it is above the cam, then there must be a problem either with the two valves, or the diaphragm. If you can find a kit for it, replacing all three should solve the problem.

Or; the fuel pipe connections are leaking air, or it has run out of fuel,

Cheers Charlie
S2 Command Recce '59
S2A 109" GS '63
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Offline Ravvin

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Re: Fuel Pump Install
« Reply #2 on: October 18, 2016, 09:45:38 AM »
Hi.
I had a nice post typed out about checking that the cam that the pump arm runs on wasn't at the top of the lobe, in effect, top dead centre. If it was you wouldn't get much travel on the manual priming lever.
I hit Post and found Chazza beat me to it and added extra things to check.  ;D

One other suggestion is to blow back down the fuel line and have a helper listen for bubble in the tank and any hissing at the fuel switch and other joints.

Greg.

Offline jsfnq

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Re: Fuel Pump Install
« Reply #3 on: October 19, 2016, 04:26:53 PM »
gidday  "pump arm not on top of lobe" ???

I have installed with the arm on at top as it appears to be only way it will go in. install on bottom is incorrect?

pump gets good suction when manual levering with fairly recent diapharam kit  replacement. yet no fuel from line into pump with no line leaks.

question- will the manual lever pump fuel even if pump installed wrong on cam?


Offline dodgeguy1942

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Re: Fuel Pump Install
« Reply #4 on: October 19, 2016, 04:52:59 PM »
Have you checked suction with hand lever after its installed in truck?

Offline Ravvin

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Re: Fuel Pump Install
« Reply #5 on: October 19, 2016, 05:19:47 PM »
What I meant about "pump arm not on top of lobe" was that if the cam that the pump arm runs on was at the top of it's "stroke", so to speak, there wouldn't be much movement when you tried to manually work the priming lever because it's already been lifted up by the cam. If you wind the engine over a half turn or so, the cam would be in a different position and you may get more travel with the manual primer and decent suction.

I had this exact problem when I replaced the diesel lift pump in my Discovery. Because the cam was at the top of its stroke, it was a real bugger the get the pump to line up as I was trying to push it into place and compress the return spring at the same time. Once I turned the engine over so the top of the cam moved around a bit, it slipped straight in.

Offline jsfnq

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Re: Fuel Pump Install
« Reply #6 on: October 21, 2016, 08:45:29 AM »
solved it.
Idiot factor.
 I installed diaphram slightly wrong. It will insert & hold in place  incorrectly & appear to pump without achieving full range of motion- hence not allowing pump to prime. many thanks for all replies.