Fuel Pump Problem

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Mar 9, 2018 | 02:08 PM

49m47

Thread Starter

Mountain Pass

Joined: Nov 2010

Posts: 180

Likes: 0

From: St. Louis

Fuel Pump Problem

Greetings
I try to start my truck every 2 weeks but sometimes.... Well life gets in the way. If it sits for much more the 2 weeks the reeds in the fuel pump reeds stick closed. I blow air through and they open back up. I'm calling them reeds because I don't know the official name and it sounds better then the circular rubber flap thing.
Has anyone else had a problem like this?

Mar 9, 2018 | 02:26 PM

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

Posts: 27,297

Likes: 1,059

From: NM

Try adding a little Marvel Mystery Oil to the gas. Those circular rubber flap things are check valves.

Mar 9, 2018 | 03:32 PM

moejr

Fleet Mechanic

Joined: Jan 2004

Posts: 1,685

Likes: 1,471

From: Mendon, Massachusetts

Also known as, mechanical fuel pump diaphragm.

Mar 9, 2018 | 07:24 PM

FortyNiner

Logistics Pro

Joined: Jun 2011

Posts: 4,995

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From: u-rah-rah Wisconsin

How old is the fuel pump?

Mar 9, 2018 | 09:08 PM

49m47

Thread Starter

Mountain Pass

Joined: Nov 2010

Posts: 180

Likes: 0

From: St. Louis

It was a new old stock that I got from a friend. So I don't know the exact age. I have had it on the truck for 3 years.

Mar 10, 2018 | 06:06 AM

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

Posts: 27,297

Likes: 1,059

From: NM

Unless it was made recently, it probably isn't ethanol resistant materials

Mar 10, 2018 | 02:51 PM

Mixer man

Logistics Pro

Joined: Sep 2014

Posts: 4,920

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From: Bothell & Silverdale, WA

If it's a NOS pump it probably has neoprene check valves and impregnated diaphragm. These won't hold up well with ethanol. Newer pumps will use a variety of elastomers such as Viton, Nitrile, and Buna-N.