Engine/Transmission (1998.5 - 2002) Fuel Filters size / flow

[csevers]

I read that A lot of people install pusher pumps and different lift pumps and larger lines from tank and so on but I have seen that most people are still using stock fuel filter housings is this not a restriction? With the small ports in and out of filter housing and over all size of filter. Is any body using any other filter housing with bigger ports. Any body Know how much gpm the stock filters will flow? Clean filter of course.



Thanks

Craig



P. S. Doing research for future fuel supply mods with Ideas I had

 

[Big White Beast]

I believe the rate is.......

45 GPH.



But hey, someone will correct me if I'm wrong. There was some discussion of this in one of the many lift pump threads.



Garrett

 

[illflem]

Oversimplification but close

At 45 gph @ 1mpg = 45 mph. With a poor fuel economy of 10 mpg 45 gph is enough to get you 450 mph. Even if half of this goes to return fuel you still have enough fuel to go 225 mph.

 

[Gonzo 1066]

Re: Oversimplification but close

Originally posted by illflem

At 45 gph @ 1mpg = 45 mph. With a poor fuel economy of 10 mpg 45 gph is enough to get you 450 mph. Even if half of this goes to return fuel you still have enough fuel to go 225 mph.

I think if you review your figures your estimate was off. If you use X over F. X being amount and F being fast. And multiply by the rotation of the earth R devided by the hair on the a$$ factor HAF. You will find 225 miles per hour should read 225. 98237 miles per hour. Remember that most of the Dodge owners in the US do not live in Montanna and have a speed limit to watch for.

 

[15w40]

When Whitmore was troubleshooting his filter problems he measured 6 psi at the inlet to the filter with the outlet of the filter free flowing. I have measured that the lift pump will flow 68 gallons per hour with a 6-psi restriction. The stock filter should be good for power up to about 500 HP with a clean filter.

 

[Wolfgang]

15w40 I have 14 PSI at idle and can pull it down to 2 PSI at WOT. This is measured at the inlet to the VP44. When I have measured this in the past pre filter I only pulled it down to a minimum of 8 PSI. I have replaced 3 lift pumps so I don't believe that is the problem. I seem to have a big restriction across my filter. Have you or anyone else seen this before and how they fixed it?

 

[csutton7]

I have a Racor unit--been using it for 2 years now---1/2" ports in and out--there's other options if you want a spin on filter---check out Summit or Jegs--chris

 

[Gary - K7GLD]

To respond to the first question, and another further down:



1. It's my understanding that the stock filter element filters down to around 10 microns - pretty small, presumably to protect the sensitive VP-44 and better protect the injectors as well - seems to me that must be finer than most fuel filters, and more sensitive to clogging - but maybe it's pretty standard - someone will correct me if I'm wrong - and probably even if I'm not... Intended point being, it's hard to say whether flow restriction is due to the element itself, or the machining and fittings in/out of the housing, or a combination of both - there was one other fellow having substantial flow problems involving the stock filter/housing dunno if he ever got his sorted out or not...



As far as the smaller sized supplemental filters some of us use with added pushers, their primary function is to filter out larger stuff that might otherwise damage the pusher - but not really sufficient for primary system filtering - mine is a plain gas system fuel filter, but hasn't presented any flow restriction to date...

 

[15w40]

Wolfgang, The Carter lift pump will not provide enough flow for more than 300 HP, 350 if you are lucky. The 6-psi drop across the filter is at a flow rate of 68 gallons per hour. The Carter pump would be pumping its guts out and drop to zero pressure at that flow rate. My post, above was to say that the stock filter will supply 68 GPH with a 6 psi pressure drop. It has been widely thought that the filter was only good for 45 GPH at some unknown pressure drop.



In my opinion, below 300HP the flow from the stock pump and filter is enough. Between 300 and 500 HP a higher flow lift pump, or pusher pump is needed. Above 500 HP both a new pump and filter is needed.



These opinions are mine and do not stand-in for a fuel pressure gauge reading.

 

[Wolfgang]

thanks this is what my experience is slowly telling me