Moose Pump customer advisory

[Agnem]

Here at Moose Labs, professor Honey Do and his assistant Beaker are always testing and improving things. One thing that recently came to light with the mods I made to the Moose Truck for the 2010 IDI Weekend, is that you may be starving your Moose Pump under certain conditions. Consequently, I post the following customer advisory:

Moose Pump customers using a Holley Red fuel pump, may under hard acceleration at around 2000 RPM and up loose inlet fuel presure dropping to under 4 PSI due to high fuel consumption rates. This may retard timing slightly, and result in a loss of horsepower. Customers are advised to monitor fuel inlet presure to determine if they are affected by this issue or not. Other fuel pumps including the factory mechanical may also be affected. Filter configuration and fuel tank conditions may contribute to the effect. This condition can be ignored safely if desired, but for maximum performance, your inlet presure should be set to maintain the recommended 5 to 6 PSI.

 

[david85]

Is this a problem for mechanical lift pumps too, or strictly for electric pumps?

 

[johnboggs21]

Is this a problem for mechanical lift pumps too, or strictly for electric pumps?

Moose Pump customers using a Holley Red fuel pump, may under hard acceleration at around 2000 RPM and up loose inlet fuel presure dropping to under 4 PSI due to high fuel consumption rates. This may retard timing slightly, and result in a loss of horsepower. Customers are advised to monitor fuel inlet presure to determine if they are affected by this issue or not. Other fuel pumps including the factory mechanical may also be affected. Filter configuration and fuel tank conditions may contribute to the effect. This condition can be ignored safely if desired, but for maximum performance, your inlet presure should be set to maintain the recommended 5 to 6 PSI.

 

[hesutton]

My fuel pressure has always dropped when accelerating. Watching the fuel pressure gauge is almost like watching a throttle-ometer. The more I push the throttle the more my fuel pressure drops. Once I reach a constant speed, the fuel pressure levels off. But, it is not the least bit uncommon for my pressure to fall below 3 psi when I'm accelerating.

I knew too much pressure was not good, but I was unsure what a low pressure would do. I don't think the Holley red can provide a constant 5 psi with a Moose pump on the truck. It certainly can provide adequate volume thougth.

When I dyno'ed, I'm sure the fuel pressure was roughly 2.5 psi at WFO.

Heath

 

[6.9poweredscout]

What could too much hurt? Say 7PSI?? What can be done to keep it up?

-Jon

 

[johnboggs21]

What could too much hurt? Say 7PSI?? What can be done to keep it up?

-Jon

too much fuel pressure can advance the timing.......7psi would probably be fine...

 

[Dsl_Dog_Treat]

Well crap! I knew I was needing more fuel but was hoping to turn it up s'more.
1250 Max on the Pyro with a stock lift pump. Tis no wonder the stock clutch is failing. lol

Gee thanks Mel, one more mod I HAVE to do now .

 

[zpd307]

is the holley blue the one that needs to be regulated down? that might be the way to go...

 

[idipwr]

Sounds like we may need a higher psi elec pump and a pressure regulator with a boost reference port(more boost=more psi) like the PSD guys run.

 

[subway]

or if you are feeling froggy put some bigger fuel line in to ease flow resistance

 

[dyoung14]

Im running an unregulated holley blue pump

 

[6.9poweredscout]

or if you are feeling froggy put some bigger fuel line in to ease flow resistance

i have all 3/8 on the scout, feed and return.

-Jon

 

[subway]

i have all 3/8 on the scout, feed and return.

-Jon

do you have a fuel gage to give us some numbers, would be curiouse to see if you held pressure better. i know it would be a little differant though being a smaller vehicle than a crew cab with less line length but could be a good indicator.

 

[hesutton]

I'm using a Facet duralift on the crew cab. Once I get that project done and on the road, I should be able to see if that pump (regulated at 7 psi) will keep up (in pressure) with a stock pump. I'm not Moose'ing it for a while. But if it can keep up with a stock pump, then a Duralift may be my next pump on the F250 with the Moose fuel.

Heath

 

[6.9poweredscout]

You mean fuel pressure gauge? No, but I think I have to add something to the agenda for the weekend. I wonder what I can find for a fuel pressure gauge? Probably not the best idea to run diesel fuel in the cab. Should I T it in before the main filter or after it? I think my racor filterhead has a port I can use for that.

-Jon