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Availability:
Only 6 left in stock, order soon!
Arrives
Friday, Jun 26
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Features
- Country Of Origin : China
- The Package Height Of The Product Is 3.37 Inches
- The Package Length Of The Product Is 2.0 Inches
- The Package Width Of The Product Is 1.43 Inches
Description
Standard Motor Products FJ503 Fuel Injector
Manufacturer: Standard
Brand: Standard Motor Products
Model: Fuel Injector
Item Weight: 1 pounds
Product Dimensions: 11 x 12 x 8 inches
Item model number: FJ503
Exterior: aluminum,stainless-steel
Manufacturer Part Number: FJ503
OEM Part Number: FJ503
Date First Available: October 10, 2007
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Jun 26
This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
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Top Amazon Reviews
I just installed this on my 2001 Chevy S10 Blazer. The stock 22 year old spider injectors finally started leaking, and it was hard to start the car. So, this Standard Motor Product injectors fit just like OEM. I did not have to modify anything or come up with clever ideas to make it work. Also, the car now starts very quickly and it runs buttery smooth. Also, the car now gets much better gas mileage. While I was doing this, I also swapped out the lower intake gaskets with some metal Mahle gaskets. This whole project took me about 6 hours. Very easy, it’s just a lot of connectors to remove and a lot of stuff to move out of the way. Highly recommend these injectors! Update: I installed these on my truck July 2023, and now it’s Dec 2024. It’s been over a year, and I’m very happy to say that these injectors are still working great after over a year! Highly recommend!
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Reviewed in the United States on July 27, 2023 by SRTRANDY
I put it on a 2001 Silverado 4.3 l. It works well. Diagnosis: I had a p0303 error code with a very noticeable miss. It felt very much like a weak spark, and was definitely running rich, so I switched wires, the plug, and then a cap and rotor swap. I had a fouled wet plug, and got a consistently strong spark. Nothing screamed fuel injection, and I never definitively nailed it down to injection, but had read the factory system does break down with time. After a compression test showed good numbers, I decided that the injection was most likely the issue, and was willing to commit the time and money to replacing it. Since I was spending the money and effort anyway, I wanted to upgrade to mpfi, and chose this system because the reviews were mostly positive. It's a big enough job, and yes the lines are stiff and tricky to route. I used the stock mounting bracket, and the job had no surprises besides one of the plastic caps came off and it was pretty tricky to reseat the injector in it. I didn't replace any gaskets and don't seen to have any air leaks. So far, I've ran about 3 tanks of gas through it and am happy. I was hoping for improved fuel mileage but didn't get it. I did get a very smooth running engine though. I even thought the engine died a few times at stops because its so smooth and quiet compared to the old system.
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Reviewed in the United States on January 18, 2022 by Wakatomika Hermit
Great product. Perfect replacement part! My only complaint was that the part came in, instructions stated I needed to by a updated bracket for replacement. Still driving the vehicle, I did not want to tear into it without all the parts needed. I could not find one on Amazon but found one on Summit site and placed an expedite order. 2 days rolled around and I never received my part. Summit had back order for over 3 weeks. I read on someone's review that the original bracket worked perfect on Chevy 4.3 so I took chance and tore into it. PERFECT FIT AND DID NOT NEED UPDATED BRACKET FOR 1996 Chevy S10 4.3 V6. Don't stress out...it will fit as if it were stock with no problem. Great part!!! Easy to install...I guess if you know your way around engines...AGAIN, I DID NOT NEED UPDATED BRACKET AS STATED FOR MY 1996 Chevy S10 4.3 V6. I could have saved a couple of days and the stress of tracking and eventually canceling an order for back ordered bracket.
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Reviewed in the United States on September 23, 2014 by Kenny Doyle
Working well in a 97 safari. Install is straight forward following instructions. Be sure to lube the injector ends with engine oil or assembly lube. Also top gasket before putting upper intake cover on manifold. Be sure the unit is fully into the upper intake cover before bolting down. I had to pull mine up a little to seat it properly into upper cover(gently clamp a pair of needle nose vise grips to the plastic ring of unit and the gently pry unit up with a screwdriver to assure its up all the way in the upper cover). Follow the video standard has and you won't have problems with routing the tubes in the intake. Van started right up and runs smooth. About a 16 hour job with removing lower intake on these vans. Clean everything as you go and take your time.
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Reviewed in the United States on June 11, 2023 Reviewed in the United States on June 11, 2023 by Fast Eddie
old spider had a stuck open poppet and the plastic around it was damaged making my truck unable to hold fuel pressure. Took me five hours to get this in and was lucky i got the injectors in the right holes correctly first try as they were rather stiff to bend into the holes. a bit of twisting the injector connectors so as to not block the intake plenum got everything in perfectly and with a strong stable fuel pressure my truck started right up after being stuck in the garage for two months.
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Reviewed in the United States on July 10, 2024 by KELSEY
Bought for a replacement for a 2001 S10 with the 4.3l motor. I also replaced some fuel lines, as well as the fuel filter. The truck kept stalling while driving, especially on the highway, with no warning at all. So at 65 MPH the truck shuts off. Being disabled I am limited to doing physical repairs. I also had some O2 sensor issues so I ended up storing the truck in a storage unit for about 2 years thinking the O2’s had something to do with it. So only about 100 miles on the motor after installing the spider and had to park it because of the pressure issue. At the time of installing this spider, my old fuel pressure tester showed 44-49psi output. I figured that was fine. I did not have the factory GM service manuals at that time. (got them on Ebay later) With very little income I bought fuel testers and even a fuel gauge to mount on the dash the following years. The gauge showed the same as the new fuel testers. This spider injector puts out 52psi, at BEST. The motor REQUIRES 63 PSI per the specs from GM (at the schrader valve). The only way to get up to 50psi is to turn the key 3 separate times to prime the system before starting. It will go: 1st turn 44psi, 2nd turn 47 psi, 3rd turn 50psi readings. When driving pressure increases slightly to 52psi. At 65mph and in overdrive it reads 49psi on the highway, well below the specs from GM. So the motor just shuts off when driving like you turned the key off. No sputter or any warning, just complete shut off. VERY DANGEROUS. So you have to coast to a stop on the shoulder of the highway and then restart the truck. Sometimes taking more than a half dozen tries to get it to fire up again. I then found this specific amazon part mentioned on forums and people having the same issues of stalling or even no start conditions. The pressure regulator appears to be the issues. People that replace the regulator then have pressures in the high 50 to 60 PSI range. Now that I have got GM service manuals and learned about this system (I’m used to pre 1980’s carb systems), it is too late to return it. COMPLETE WASTE OF MONEY. So I have to tear back into the motor to replace the regulator just to see if this spider will actually put out the required 63 PSI output. So new gaskets and regulator just to make this thing work. DO NOT BUY this junk spider. If you do, look up your PSI requirement and test it the moment you install this junk spider. I guarantee you it will not put out enough pressure if your system needs higher than 50psi.
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Reviewed in the United States on December 23, 2022 by Kriss L
Installed on a 1998 GMC sonoma 4.3 w code v6 SLE pickup. Very nice unit with fantastic instructions. Does not come with upper intake cover gasket like another reviewer stated. They must be thinking of the o ring around the fuel inlet that sticks through the cover. I reused my old one which should be the case for most people. But if you want to be sure, pick one up. It also does not come with the mounting bracket for inside the intake manifold but fits the stock one no problem. Instructions make it a breeze to put in place of the old unit and it works great. My truck now runs as smooth as when it was new. Amazon has an amazing price on this piece and I am very happy with purchase.
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Reviewed in the United States on April 20, 2011 by M Costa
Not sure what year started the no fuel return for Chevy 4.3, but the plastic distributor did not work for my 2010 Chevy express. Had to use the new injectors with the old FI distribution box and old fuel damper. Dissatisfied and hope the vehicle application chart is updated. Lot of money and time involved to have this happen. With the above being said, the van runs much stronger with the new injectors and lower/upper intake gaskets.
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Reviewed in the United States on August 6, 2023 by Gabriel