Wednesday, July 01, 2009

Under pressure

The PI piffling continues in the heat - great for vapourising all the spilt fuel just hope no one lights up nearby or it's instant BBQ!

I never knew there were two types of pressure relief valve - the long ones are easily dismantled and examined but the short one is a bit of mystery to me. The brass piece is just a 3 way, the next segment is just a housing for a mesh filter, the actual PRV is in the end. On the short one looks to be very similar to the normal long type but I can't see how to take it apart. Never mind, I'll see if it works and adjusts OK. I'll have to use the car as the test rig as I haven't built a bench test rig yet.

I have now been through my stock of pumps and tested every one on the car. Which one is the best? Well would you believe it, the KMI one that wouldn't run and I took apart and cleaned! All bar one actually pump, 3 have failed shaft seals so they piss fuel out of the tell tale and one just won't hold a constant pressure as it over heats within 5 minutes and screams like 12 year old at a Jonas Brothers gig.

That leaves me with the pump that won't make 106 psi for long enough and the KMI one I "refurbished" as the only serviceable ones out of the whole lot! Proof, if proof were needed, that you can't buy anything decent for less than a tenner - well I guess you could say that the KMI pump cost me fifty quid and came with a load of spares :-)

So, the quest is on for seals and I'll refurb them all (maybe the one with the broken magnet might be last, not sure about that one.)

I started to look into whether I could get some shaft seals, I found them quite easy, it's part number 517419.

Prestige - £8.95

Rimmer's - £10.29

Witor's - £9.95

Canley Classics - £7.35

As far as I can tell all the seals, brushes, "o" rings etc are available, Rimmer's do a kit which appears to contain all you need for just shy of £40.

I think I'll get on the blower tomorrow and see what I can rustle up, I've got 5 pumps to build :-)

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