Lift Pump and FP

[HEMI 71 GTX]

I have been reading alot of stuff here about the failure of the lift pumps. So I am curious how you guys who have added Fp gauges are not blowing out your sending units for the gauges you bought that don't go over 16psi. I wanted to get a cyberdyne dig gauge but after speaking with their engineering dept I was told if my FP went of 16psi it would toast the sending unit(s). I bought a SW 0-100 with 2 sending units and a a/b switch, but have yet to install it. Any comments?

 

[MCummings]

I have a 0-15PSI Fuel gauge from Autometer, for about 2-3 months now and it is fine so far.



The only time I saw anything over 15PSI is when I bump the starter to prime the truck, 100% of my driving time has the F. P. gauge under 15PSI. My Idle pressure is 14. 5 PSI and WOT is 9 PSI.



My Lift pump has only 2,500 miles on it so far.



I think it will be all right to go with a 0-15 sending unit and gauge, But My Gauge is still fairly new.





MerrickNJr

 

[HVAC]

180 PSI Capable

I've been using a SPA digital gauge for a year now with great success. The pressure readings will go up to 180 pounds.





*SPA Distributer*

 

[HEMI 71 GTX]

How much and where do I get one?

 

[EMDDIESEL]

After speaking to AutoMeter on several occasions regarding this topic, they told me there 15psi gauges and senders will only handle a 4psi overload without any problems, anything more and it may fail (Not burst, just stop working). I use a 0-35psi Boost gauge as my fuel pressure gauge. I had inquired about a custom 0-35psi fuel pressure gauge and they told me to just make a "Fuel Pressure" label with my computer and stick it on the boost gauge. Since if i did order one custom, all they would be doing is custom silk screening one anyhow. All mechanical pressure gauges weather they are fuel, oil or boost pressure gauges use the same internals.

 

[Texas Diesel]

VDO makes an electric 0-30PSI. Best part is there is no diesel fuel inside the cab like with a mechanical gauge. Cost was around $50

 

[HVAC]

SPA Digital Gauges

Hemi, you can purchase the SPA gauges through me @

http://www.PerformanceDiesel.bigstep.com/



We are the people that brought these gauges to the diesel pickup market. Thanks to David_VT and Mike Crossley too.



*SPA Digital Gauge Distribution*

 

[Archive]

Flammable liquids plumbed into the cab...

HVAC,



Do the SPA's use a remote sender, or do they require a direct pressurized fuel connection??

 

[Bigsaint]

Top, they use a remote sender, no diesel enters the cab.



Scott W.

 

[Deezal Man]

Without getting into the "in-cab" or "placement" discussion.



Since I already have 3 gauges in the truck, I bought a simple $8 0-30 psi liquid filled gauge and installed it on top of the fuel filter housing. (output to injection pump).



This should provide me with enough info to determine if I need to further investigate.



Meaning, my truck with a new lift pump runs between 14-15 PSI at idle. If I see anything less, I know one of two things are happening. The pump is failing again, or my filter needs replacing.

 

[Shooter]

Originally posted by Texas Diesel

VDO makes an electric 0-30PSI. Best part is there is no diesel fuel inside the cab like with a mechanical gauge. Cost was around $50

I went through a VDO catalog and could only find 15# mechanical's. ended up getting a 16# SW. Where did you find the VDO listing ????

 

[24V-DSL]

Autometer tech told me different

I'm about ready to order the 0-15psi autometer 2661, Z series, electric.



I've seen the posts re: the sender/gauge failing if exceeds ~4lbs.



The tech I spoke with today, without hesitation, told me two things:



They have a "new and improved" sender, which is brass/copper colored that replaces the stainless colored old sender. He said these were revised as some of the old senders had too high a failure rate.



The 0-15psi gauge is designed to handle up to 25lbs. psi before it will electrically fail, so he didn't think we should be worried about this range gauge for the cummins.



Anyone want to weigh in here?



Some have said that the 0-15psi gauge would be fine if you had a "stock truck"... ... ???



What does "stock truck" mean? Is this referring to stock lift pump, no pushers, etc. , OR, does it mean that if you have bombs like injectors, ez, etc. that this somehow renders the 0-15psi inadequate. I need to have this clarified before I make my gauge range choice.



Thanks... .

 

[Bigsaint]

By saying stock truck, they are referring to your lift pump. You have probably seen the FP psi's posted by the members that are using the pusher pump system, most are well above 15 @ idle. If you go the route of an aftermarket, single lift pump, you could also go way over 15 psi's @ idle if you do not regulate the psi's down via the dead head on the pump, if it has one, or a external regulator (can be either dead head, non returning or a return/bypass type of regulator, that returns the unused fuel back to the tank by using a seperate fuel line as a return). Some of the high flow lift pumps are not dead head regulated and require a seperate return to adjust psi's, which can go as high as 45 psi's at idle, way too much for our application, the psi's, that is. Sooooo,, unless you plan on adding a non-regulated and high psi aftermarket pump ( the Mallory 4150, for example, can only see about 14-15 psi's max at idle, there are others, such as the $99. 00 Summit pump, which state that they put out about 18 psi's at idle) a 15 psi FP gauge should be fine, especially if you mount the sender in a post filter location, as there is some loss of psi's through the fuel filter.



Scott W.

 

[24V-DSL]

Thanks, Bigsaint



This helps, greatly. I will be mounting post filter.



Joe