Topic: impulse fuel pumps – Antique Outboard Motor Club,Inc

This topic has 9 replies, 5 voices, and was last updated 9 years, 5 months ago by Buccaneer.

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June 17, 2015 at 11:07 pm #1780
Buccaneer
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US Member
I can’t seem to find a new Tillotson FP-4 fuel pump kit / diaphram for
my 7 hp Sea King K700.
What’s a cheap impulse type fuel pump that would work for this application?
I’ve seen these mentioned on the board in the past, but a search for "fuel pump"
says it’s too common of words!
Thanks, Buccaneer

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June 17, 2015 at 11:18 pm #18306
mercuryman
Participant
NEW FUEL PUMP FOR HONDA 16700-Z0J-003 ENGINES

Go to Ebay and enter the above it will be a pump for $7.25 I used one of there on a Johnson 5.5 1955 model
June 18, 2015 at 2:52 am #18343
Buccaneer
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Awesome, Thanks Mercuryman!

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June 18, 2015 at 3:15 am #18346
legendre
Participant
To be sure – is this is the type of pump that takes a pulsing vacuum line on one port, and uses it to drive a low-pressure fuel flow through two other ports on the pump?
June 18, 2015 at 3:33 am #18348
retiredoz
Participant
I think I’d rig up a gravity feed just to see how the thing behaves…
June 18, 2015 at 12:57 pm #18359
Buccaneer
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US Member
Correct on pulsing vacuum port, one fuel inlet, one outlet.
I’ll tear the pump apart today, but presume the diaphram
is toast. Good idea on the gravity feed test.
Ordered the fuel pump mentioned on Ebay. Even
if I don’t need it for this outfit, good to have one on hand.
Thanks!

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June 22, 2015 at 5:02 pm #18677
Buccaneer
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I received the "NEW FUEL PUMP FOR HONDA 16700-Z0J-003 ENGINES"
from EBay today. None of the three hose connections are labeled
as to impulse, inlet, or outlet, and no diagram in the package.
Is the upper section that has the breather screen the impulse port?
Thanks for any clues!

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June 22, 2015 at 5:15 pm #18679
mercuryman
Participant
The top one is to engine vacuum and blow through the other two there is a check valve and see which way the air flows.
June 22, 2015 at 7:36 pm #18685
chris-p
Participant
If you can blow, but not suck, it is the inlet.

If you can suck, but not blow, it is the outlet.

The pulse will let you do both. Sort of.
June 22, 2015 at 8:22 pm #18698
Buccaneer
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US Member
Thanks Chris…… that’s the kind of trouble shooting I
can handle!

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impulse fuel pumps

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