Well, for over two years the Holley has been flawless running along with the in-tank factory retrofitted pump. Still pumps at 20-22psi.

Tonight, I noticed diesel on the ground toward the back of the truck. Sure enough the Holley is leaking from the bottom plate.

Looks like the gasket has swelled up, and the mounting isolator has swelled up.

Guess this is what we have to look forward...pumps and stuff going south

So the next question, what fuel system out there is ULSD compatible??? I would be PO'd if this was a 500 buck fuel system that did this, not to PO'
being that is a $100 buck, 2 year old pump.

Need something to run with the TST and the soon to be here MP8.

 

I dont see how the ULSD could hurt a Walbro pump(after seeing mine, no seals or gaskets to leak, just hoses).

 

Maybe it is a loose fitting or a hoe in need of replacement? A close inspection might reveal wear and age, maintenance needs.

CD

 

I thought some of the holley pumps werent compatible with diesel?
maybe because of the gaskets, just like not all fuel hose is rated for diesel fuel....

 

Nah, its not a loose fitting or the bolts holding the pump together. I put a wrench on them last night, its a ever so slight drip....that makes a huge mess under the truck and the driveway.

Its been on then for over 2 years, and 50K miles or more, and its been fine. I've taken it apart about a year ago to check the internals, and they looked like new. Now all of the sudden we have ULSD, and the seal goes south.

I could get a repair kit for about 15 bucks from Summit, but that would be futile if this is what happens.

 

You running any additives?

Just to keep the seals lubed up, keep them from drying out and cracking...

$15 isnt bad if that will fix it, and run an additive...

 

Well I called Holley this morning.

They said that the Holley Blue is not "officially" rated for diesel use, but many have had good luck with them.

HOWEVER......that they have had more than a few calls lately about the pumps leaking. Told them that they could add me to the list of leaking pumps.

As for additive, I have been running the Power Service stuff from Wal-Mart.

 

Cool, same here, I may think about some 2cycle but im still hesitant...

Did holley have any suggestions, or offer any fixes for the leaking pumps? Maybe as a warranty defect(although im sure since its been on two years its out of warranty)
Still, is there nothing they can do on the seals for diesel fuel compatibility?

 

Interesting. I've been running a holley for a little over 3 years now and even with the ULSD I haven't had an issue with it. It's still pumping away. 15psi at idle and 11 at wot with everything turned to kill.

 

How do you guys have your Holley pumps plumbed? Does it just go in-line with the existing pump and plumbing?

 

Yes.

Its plumbed back by the tank, mounted on the frame. Its wired with a relay, switched by the factory fuel pump power, with power coming directly to the relay from the battery with a fuse.

Mine sits at about 20psi at idle, and 18-19 at WOT.

As for Holley, they were pretty much useless. Just "its not recommended, but people have had good luck with them".

I am really tempted for a whoping 15bucks to just get the rebuild kit and see what happens. Its alot more convienient and certainly less expensive than a whole new fuel system.

 

Smkn600CTD,

Thanks for the info.

Does someone sell this in a kit? Or did you piece it together yourself? Do you need to drop the fuel tank for any part of the install? I want to add a secondary/new lift pump but want to keep using the stock pick-up in the tank. I don't really like how the others start starving for fuel before the tank is really near empty.

And sorry for hijacking your thread...

 

I removed my stock pump and ran -8 line from the tank to the injection pump on my truck and mounted the holley down on the frame by the transfer case. I've got a 30 amp relay powering the holley that is triggered by the stock lift pump harness.

 

No kit needed.

I used a small pipe cutter, and cut the factory line back by the tank along the frame. Get some fuel hose, hose clamps and hose barbs for the pump. Drill the frame to mount the pump, and slide the hose on to the hard fuel lines. Lastly, wire it up with a relay using the factory lift pump power to switch the relay on/off.