fuel pumps

[Antz]

Im going to be replacing the in-tank pump on my 240 soon with a top notch high pressure pump and it got me thinking.

Arent 240s a twin pump setup with an intank and external?

If thats the case, where is the external pump located and how do I go about removing it completely from the system since the in tank pump Im fitting is more than capable of supplying what I need for this engine and any future specs as wild as my dreams can create. If a jobs worht doing, its worth over doing!

Im guessing the external pump will be on the little shelf just in front of the rear wheel on the left hand side?

And just to clarify, the cars a 1988 GLT that was running K-Jet.

[leftfootleashed]

Originally Posted by Antz

Im guessing the external pump will be on the little shelf just in front of the rear wheel on the left hand side?

Yep.

Out of interest, why can't you just replace the main pump with a more powerful one and leave the in-tank one alone? Seems like it'd be easier.

[Antz]

Because I found an in tank pump that was much better for a far cheaper price than an external one.

I'd rather keep the internal and bin the external than have to fanny around with two pumps.

[leftfootleashed]

Fair enough. Replacing the two prone-to-fail pumps with one strong one seems like a good idea. The internal one's more difficult to replace (and I had assumed find an uprated one that fits) but if it's cheaper then why not.

[Antz]

Finding an internal one was a doddle. There are a whole range of in tank uprated pumps available since most Jap cars use them. You can get them rated up to about 1100hp now depending on the size of the fuel lines you use.

I was just wondering how to ditch the external. If its simnply a case of removing it and piping between it.

To be honest I havent looked at it to assess the situation. Im sure once I have, ill find things will slide into place.

More time spent lying under the car in the dark surrounded by LED lights I suppose!

[leftfootleashed]

I assumed finding one which would fit would be more of a problem but I haven't actually replaced one myself so I don't know exactly what the setup is so if you've found one, great. (1100hp? Good luck running that off a 12V battery)

The input and output hoses are different sizes but I'm sure you could get an adapter. Obviously the hose into the back of the main pump is going to be seeing higher pressure than previously, but the standard rating seems to be 300psi with a 3:1 safety factor anyway so plenty of headroom. Good luck!

[wooble]

yours was originally a GLT, right? the main high-pressure pump is on a cradle bolted under the car, just ahead of the tank on the passenger side, along with another doodad whose name I forget, but I believe is a combination pressure regulator/pressure wave damper. on LH cars that doodad is replaced by the filter, which moved back there from the firewall.

[leftfootleashed]

Originally Posted by wooble

another doodad whose name I forget, but I believe is a combination pressure regulator/pressure wave damper.

Believe you mean the accumulator, but that's basically what it is.

[wooble]

Originally Posted by leftfootleashed

Believe you mean the accumulator, but that's basically what it is.

that's the name I was grasping for. oh, and I remembered something else - something at the back of my mind tells me Volvo used a strange non-standard size for the high-pressure fuel hoses and barbs which is a pain to find - worth bearing in mind.

[leftfootleashed]

Originally Posted by wooble

something at the back of my mind tells me Volvo used a strange non-standard size for the high-pressure fuel hoses and barbs which is a pain to find - worth bearing in mind.

There's a short piece of rigid fuel line out of the pump into the accumulator. Mine had a tiny leak and I just took the old bit to the motor factors and got a piece of overbraided hose the same ID. I've heard you can get the part from Volvo but it's hideously expensive (though it probably includes the joints, banjo, etc.). Standard fuel hose is rated to 300psi though, as I said, which is more than enough. I don't know the ID of the hose but can measure the spare bits if necessary.