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Which Fuel pressure/oil pressure sensors are people using?

EFI Wiring Fundamentals

Discussion and questions related to the course EFI Wiring Fundamentals


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Hey guys I was wondering if there is much value in buying genuine Haltech fuel/oil pressure sensors for over $300+ ea or buy a generic one from eBay that can be of good quality maybe a bosch OE Style pressure sensor would be ok?

some of them are as cheap as $100.

Just wondering if this would be a safe alternative as I don't want any dodgy sensors sending me dodgy numbers which could result in a hurt motor, just wondering what people are using as a cheap reliable alternative to the major brands?

Cheers in advance. .

There are lots of reasonable quality solid state pressure sensors. In the USA, ones from AEM and Autometer are reasonably priced and have worked well for many of our customers. I think US$120 - US$150 is a fair price to pay for a quality pressure sensor.

Basically what I'm trying to ask is, is it acceptable to steer away from the name Brand pressure sensors and use one like this example I have lineed below for you. The price difference is 250 to $300aud difference and if it reads pressure accurately what does it matter?

wouldn't the name brands be of an OEM style rebranded like most of them as they don't make their own sensors? they just use ones they trust and rebrand them with their name.

Look at this on eBay http://www.ebay.com/itm/182275417046

Would an oil pressure sensor off an GM LS motor work adequately in an aftermarket wire up scenario?

I would be careful with that ebay sensor, it looks very much like the $13 chinese ones... http://www.ebay.com/itm/322304445510 I have heard a few horror stories so I wouldnt trust them on some application that if it "blew apart" or started leaking could damage the engine or cause fire. I have a couple of these on my dyno for MAP/EMAP, boost etc but they arent going to do much harm in my scenario.

Note you can get genuine Honeywell sensors for http://www.mouser.com/ProductDetail/Honeywell/PX3AN1BH010BSAAX/?qs=sGAEpiMZZMvhQj7WZhFIAOhvWFKacVxN8LXZgeL6m4dKq9jBwWQe8Q%3d%3d

Edit: Oops, just noticed that one I linked was a 1/4NPT, here is an 1/8:

http://www.mouser.com/ProductDetail/Honeywell/PX3AN2BS150PSAAX/?qs=sGAEpiMZZMvhQj7WZhFIAMbIIQV5NoTbL6isqunddabblqqeR%2f4hsw%3d%3d

Thanks for the heads up about the China one, it's hard to tell these days as almost everything is Chinese made.

If the Honeywell sensor is E85 compatible I'll definitely get that as it's well priced.

thanks heaps for your feedback it's much appreciated

[email protected] - they're the sensors I was looking at buying. Good to know you've had good experience with them. Thanks.

Mouser.com is out of stock still of the 1/8 Honeywell pressure sensors, will have to go pay up for a rebranded one unfortunately.

After doing a bit more research, the PX3AN2BS150PSAAX sensor is no good for fuel and oil. The internal seal is made from silicon and shouldn't be used for these reasons.

Hmm well thatso not good.

Wonder if the aem, haltech are made the same way?

Have a read through this document from Honeywell. Page 5 explains how the different part numbers represent different configurations you can get in that sensor.

http://www.mouser.com/ds/2/187/honeywell-heavy-duty-pressure-px3-datasheet-323137-1086227.pdf

would there be any down side to using an absolute pressure sensor for oil and coolant pressure? apart from loosing 14.7psi off the maximum?

absolutes are available locally in 1/8npt.

https://au.rs-online.com/web/p/products/1115920/?grossPrice=Y&cm_mmc=AU-PPC-DS3A-_-google-_-3_AU_EN_Pressure+Sensors_Honeywell_BMM-_-Honeywell+-+Pressure+Sensors+-+1115920-_-%2Bpx3an2bs100paaax&matchtype=b&kwd-368529243346&gclid=Cj0KCQjwlK7cBRCnARIsAJiE3Mjm7bjJitHoq2Qa1vXlBNbIgEftMdwlbLhyD6HRexex49rZFvdNwGgaAuDqEALw_wcB&gclsrc=aw.ds

otherwise i will just need to run a 1/4 to 1/8 adapter witht he below:

https://au.rs-online.com/web/p/pressure-sensors/1115908/

cheaper sensor at least to offset the cost of the adapter.

No, will be fine except for the slight loss of range you've mentioned :-).

The first sensor you've linked has a silicone seal (PX3AN2BS100PAAAX)

We use stainless steel AEM pressure sensors on about everything. I'm sure they are re-branded with AEM stickers. Many years ago we used the AEM brass sensors but kept seeing the sensors fail over time and from that point on switched over to the stainless steel sensors and never had a problem. Almost every customer car I install oil pressure, fuel pressure and map sensor all stainless steel sensors. I average 2-3 cars a week with this setup.

ordered 2 off PX3AN1BH010BSAAX. from RS for $45 each delivered.

will report back when i have ran them (coolant and oil pressure, i run ethanol fuel so these cannot be used for fuel pressure. will need some MLH for fuel pressure), i realise they are 1/4" npt which will require an adapter to suit my flexible lines but in stock and cheap is hard to resist.

Good man, I look forward to hearing how they go.

I've used el-cheapo sensors from Aliexpress before, and compared them back to back with some Honeywell MLH sensors and any error was within 0.1%... However I wouldn't trust them to remain reliable!

I did some research the other day and decided the MLH was the way to go for E85 and oil. Particularly this model https://www.digikey.co.nz/product-detail/en/honeywell-sensing-and-productivity-solutions/MLH150PGB06A/480-2579-ND/1248914

Found this very informative comparison sheet somewhere online.

Attached Files

why did you go vented gauge (relative)?

That's how I understood Fuel/Oil pressure is measured. Absolute is generally only used for Manifold pressure.

Done some more reading; looks like you are right Josh. Sealed Guage would be the one to go for (wouldn;t be affected by engine bay temperature and if there was an overpressure event and the diaphragm failed, you would have an extra barrier stopping a fuel/oil leak)

https://www.digikey.co.nz/products/en?keywords=MLH150PSB06A

Zac, how about a webinar about temperature and pressure sensors to clear this up?

Have thrown it into the webinar requests log we've got here, its an interesting topic for sure. I like to use sealed gauge senders where possible, as I dont want that signal moving around in relation to atmospheric pressure and temperature, as these correction factors are usually taken care of in other parts of the tuning process.