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Old 05-26-2020, 09:29 PM   #1
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Default Help finding fuel pressure regulator for 86 D21

I am looking for a fuel pressure regulator for an 86 D21 with V6. I believe its same part as for inline 4 cylinder engine. I have had no luck with Nissan nor aftermarket searches. Any help would be appreciated!
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Old 05-26-2020, 09:44 PM   #2
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Does this help?

https://www.nissanpartsdeal.com/oem-...regulator.html


EDIT: Guess your right. Mostly NLA OEM parts for our trucks. I'm running into this also.

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Old 05-27-2020, 12:40 AM   #3
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And ebay

https://www.ebay.com/itm/373062757770
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Old 05-27-2020, 01:35 AM   #4
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Thanks guys. Yes, the OEM part 16240-03G15 is no longer available.

JP2code, do you know if that walker part number 255-1075 would work for 86 D21? The Walker website lists a different one for my truck. If its just a matter of the shape I would be willing to give it a try.

Note I would also be willing to go to adjustable fuel pressure regulator if someone knows what adaptor would mount up to my throttle body.
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Old 05-27-2020, 01:46 AM   #5
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Quote:
Originally Posted by D21s View Post
JP2code, do you know if that walker part number 255-1075 would work for 86 D21? The Walker website lists a different one for my truck. If its just a matter of the shape I would be willing to give it a try.
No, I don't know, and I wouldn't be willing to give it a try - not at that price.

I was just outside on the phone when I saw your message, and that's what I saw on eBay.

Using 89's link, it looks like your FPR is Part Number 16240-03G15. Is that what you got?

If you have an auto parts store nearby, they usually carry these. Definitely get a picture (or bring the part in with you) so that you don't get something that doesn't fit.
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Old 05-27-2020, 01:48 AM   #6
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Update: If you have one of those throttle bodies with the FPR mounted to it, you might actually have to search for and buy a complete throttle body assembly - which sucks!

https://www.ebay.com/itm/303266915845

https://www.ebay.com/itm/283821960523
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Old 05-27-2020, 02:16 AM   #7
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Yes, mine is part number 16240-03G15, but I cant find it nor aftermarket replacement anywhere. For some unknown reason, all the replacement parts for that truck are no longer available.

The truck runs fantastic, but if I try to restart a hot engine after its been off for a few minutes, it floods and is very hard to restart. I read somewhere on this forum its from old diaphram leaking gas int vacuum port on the throttle body. So Im thinking an old throttle body with old regulator will likey have same problem.

Id like to get new replacement or advice on how to plumb this for universal, adjustable regulator.
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Old 05-27-2020, 02:30 AM   #8
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I saw throttle body rebuild kits on eBay, but I don't have great luck with rebuilding carbs.I usually leave a tiny leak somewhere, so I just get someone else to do it that is experienced.

You might try looking for an old mechanic in your area who knows how to rebuild carburetors and see if he can rebuild your throttle body.
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Old 05-27-2020, 08:56 AM   #9
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Even if you buy a throttle body for those ridiculous prices on eBay, you run into the same problem. You are buying a part, a piece of tech that hasn't been made since 1989. And it's used.

I know this doesn't help, but this is the reason I gave up on Nissan trucks made prior to 1990. The aftermarket support for pre-1990 Nissan trucks is no better than fair, if that. If some aftermarket company actually starting making new replacements for a throttle body, complete with the peripherals, they would make a ton of money.

My last Nissan prior to the green truck I have now was an 89. I had no end to the throttle body problems although I was able to keep it a daily driver for three years. But after that experience I said no more.

If nothing else works, you could try the carb conversion. It lowers your mileage, but it works. I know some throttle body owners have done that.
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Old 05-27-2020, 02:43 PM   #10
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Thanks. I considered doing the weber carb conversion but was concerned if everything would work properly or not as I have an automatic and AC.

I was thinking of modifying my regulator for use as an adaptor. Then Id add an inline adjustable regulator I could dial in. Does anyone know what the effect would be if I simply blocked the vacuum port on the regulator to stop the fuel leak? Does that increase or lower the fuel pressure to the throttle body?

If anyone has converted their truck to an adjustable fuel pressure regulator, or Weber carbs, or found source for aftermarket OEM style regulator that fits, please share your info with us.
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