Hey all,

I decided to pick up another Jag, this time an XJ40 that's been sitting for... quite a while. I dragged it home, hooked a battery to it, and no action from the fuel pump. Checked fuses and relays for it, no dice. I assume the fuel pump is bad, which is to be expected after sitting for so long.



From looking at it, it looks almost no different than the standard Bosch in-line pumps that are used on tons of other cars (like my XJS for example). However, it has the threaded portion on the output side. From looking at the hose, it looks like one of those barbed and crimped connections, like on the fuel rail of my XJS.

My question is, has anyone just cut the metal fitting off and used the regular style pump? I have a few spares sitting around I've collected for my XJS, and it would save me the trouble of ordering and waiting on the "proper" one, and make it easier to replace in the future if I need to.

 

CBC2576

I'll have to get the filter and pump off later this week and investigate, but looking at this picture of the hose I found online, it definitely looks like the weird barb fittings used on places on my XJS.

If so, I could either: Replace the hose and leave the fitting off of the pump end, and use the standard Bosch pump I have for my XJS (assuming the hose is the same size), or at the very least replace the rubber hose and leave the fittings on both ends to keep it stock

 

I think that the only thing youd need to be concerned about is the pressure. I know that in my 92 xj6 the pressure at the rail should be 40- 45 pounds. Im not sure what the Xjs pumps pressure should be, but I suspect that it may be higher.

 

As far as I can tell, the pumps are 100% identical (in terms of rated pressure and volume) minus the output fitting style. Even if the pressure were higher, it'll just bypass via the regulator and be sent back to the tank via the return line.

I just don't want to cut into the hose if it's not a regular barb fitting underneath the collars like I suspect, as it seems like that hose is quite expensive to get ahold of.

Even if I decide to not convert to the more standard fuel pump, I'd like to know if anyone else has replaced the rubber line and reused the end fittings, the line on mine from what i can see looks quite worse for wear, lots of microcracks going on.

 

As an update: I decided to just go ahead and buy the regular pump meant for the car, rather than trying to make the pump for my XJS work.

However, judging by the condition of the hose, I will no doubt be replacing it before getting the car fully roadworthy. When the time comes, I'll cut the rubber off and see if it's replaceable by itself (I'm 99% sure it is since it looks identical to the fuel rail connections on my XJS)

We'll see if it runs when the new pump arrives, everything else I've been able to try seems to function correctly (outside of maybe the radio)