Re: [MV] quite possibly have a serious problem with my 6.2L.... a long story

From: uniquemachine@cybcon.com
Date: Mon Jan 12 2004 - 13:34:01 PST


It is my understanding that electic fuel pumps are supposed to be
mounted as close to the fuel tank as possible, because they do not
really 'suck' but rather 'push' the fuel.

Jon

>
> ----- Original Message -----
> From: "Chris Stansbury" <chris_stansbury@hotmail.com>
> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
> Sent: Monday, January 12, 2004 12:37 PM
> Subject: [MV] quite possibly have a serious problem with my 6.2L.... a
> long story
>
>
> > When I went to start my M1009, I noticed that I didn't
> > hear the familiar putter of my inline electric fuel pump. Hmmm, I
> > said,
> and
> > started it anyways. The pump had been making more noise recently
> > and
> would
> > sometimes start working after a few seconds which I figured would
> > happen this time.
>
> Fuel could've waxed up with the cold and clogged the pump *but* if
> you've simply replaced the manual pump with an electric and 'wired it
> in' to the same spot as respects the fuel hoses - you're going to go
> through pumps. They need a filter on the input side of the pump (i.e.,
> supply side) or they will have a short lifespan when coupled to the
> average military fuel tank, as there's no filtering whatsoever before
> the fuel/water/tankcrud gets sucked into the pump and sent on to the
> Stanadyne filter on the firewall. I've been too lazy to put one on my
> own 1009 before the electric pump - but have paid for it in pump
> failures (2). In fact, some of the NAPA-type aftermarket pumps even
> come with a disclaimer that any warranties are null and void if the
> pump is installed without a supply-side filter, so it's a known
> concern.
>
> Many, many have suggested installing a Racor-type cartidge
> filter/water separator inline before the electric pump, but the
> recommended one for the 6.2's system is something obscene like $200
> bucks. I guess it doesn't seem like a bad investment now that I'm on
> the wrong side of two electric pump failures - but still - ouch. I
> wonder if one could re-jig the system to have the electric pump suck
> the fuel THROUGH the existing Stanadyne filter, thereby getting the
> benefit of both the fuel heater and the water separator before sending
> the fuel through the pump and on into the injector pump. The only
> thing I can think might be a concern is a potential overall decreased
> rate-of-flow in high demand situations, but without trying it, I
> really can't say.
>
>
>
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