Check fuel pump pressure with AC gauges?

96-2D-Hoe · Feb 22, 2019

Want to check my fuel pump pressure. I have an old fuel pressure gauge but it only goes to 10psi.

I have a set of AC gauges that could work if I can connect them.

Anyone good with threads and fittings and know what I would need / if I could connect the AC gauges to the schrader valve on the fuel line?

96-2D-Hoe · Feb 22, 2019

I can't find a way to do it and not sure it can be done. This is probably my cheapest/best option
https://www.ebay.com/itm/Universal-...ter-Test-Kit-Car-System-Tool-Set/192794672383

Doubeleive · Feb 22, 2019

I bought something similar for like $19 seems to be worth the price paid came with the case and various adapters, no need for a $300 tester kit unless your using the tool to make a living

east302 · Feb 23, 2019

Got a harbor freight near you?

Their test kit is maybe $20-30 and works well enough for a few runs. Plus you can take it back when it starts leaking.

I’m not sure what material is used on the a/c hose kits, but I’d bet that the gasoline will eat through whatever seals they use.

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96-2D-Hoe · Feb 23, 2019

Thanks for the tip, and Harbor freight has a 20% off deal this weekend, but the only one they seem to have is $90

Edit.
Just found one that looks almost identical to the one on ebay. Doesn't have gauge in the title and is why I didn't find it at first.
https://www.harborfreight.com/fuel-injection-pump-tester-62623.html

With 20% off makes it $16

east302 · Feb 23, 2019

That looks like it, mine is a couple years old and came with only styrofoam. Gas has eaten it up but it works well enough for the couple times I’ve used it.

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96-2D-Hoe · Feb 23, 2019

So many tools I want from Harbor Freight. Going to cost me a lot more than $16 to go there!

iamdub · Feb 23, 2019

I thought the A/C gauges are designed and calibrated for the refrigerant they measure, like you have to have different gauges for R22, R12, R134A, etc.

I can't imagine how they'd respond with gasoline in them. The gauge would probably read inaccurately and they'd be contaminated and the seals may dissolve.

So, yeah, HF FTW on this one.

96-2D-Hoe · Feb 23, 2019

iamdub said:
I thought the A/C gauges are designed and calibrated for the refrigerant they measure, like you have to have different gauges for R22, R12, R134A, etc.

Gauge reads pressure and it would work, might mess up some seals though. The different gauges for different refrigerants show the evaporation temp. Some new refrigerants run at very high pressure and those gauges have a different pressure scale.

Got away lightly at Harbor freight. Only bought $65 of junk. They didn't have a couple things in stock I probably would bought.

east302 · Feb 23, 2019

Lol, I see you picked up the free magnetic flashlight.

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Check fuel pump pressure with AC gauges?

96-2D-Hoe

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