Flo1993 Posted January 27, 2018 Report Share Posted January 27, 2018 Not getting any fuel to carburetor so i installed a new mechanical fuel pump and still no fuel to the carb The new pump has an arm that is a little bit bigger than the old pump. I was told i have a z20 but the local parts store is telling me that the bigger arm is for a z22 so i am lost. How do i know if the arm is making contact Quote Link to comment
datzenmike Posted January 27, 2018 Report Share Posted January 27, 2018 The '80 720 was L20B powered. The dipstick should be on the passenger side. Look just behind the handle and stamped on the flat spot on the block will be L20B Now go get an L20B pump. Why are you replacing the pump? If no fuel have you checked that the tank is not empty? That the fuel filter is not clogged? That the fuel lines is not clogged? Get a small pop bottle with gas and put the hose to the pump into the bottle. Put the output hose into another container. Pull spark plug wire off coil so engine does not start and turn engine over with starter. You should see fuel gush in spurts into the receiver container. 1 Quote Link to comment
Draker Posted January 27, 2018 Report Share Posted January 27, 2018 Not getting any fuel to carburetor so i installed a new mechanical fuel pump and still no fuel to the carb The new pump has an arm that is a little bit bigger than the old pump. I was told i have a z20 but the local parts store is telling me that the bigger arm is for a z22 so i am lost. How do i know if the arm is making contact You'll know if you pull the valve cover and look. 1 Quote Link to comment
Flo1993 Posted January 27, 2018 Author Report Share Posted January 27, 2018 I figured it out. The new pump has a longer arm so i had to remove the spacer. I took off the cover and saw that it was making contact. The old pump leaked gas out by the arm. Quote Link to comment
Flo1993 Posted January 27, 2018 Author Report Share Posted January 27, 2018 My dipstick is on the driver side. Quote Link to comment
banzai510(hainz) Posted January 27, 2018 Report Share Posted January 27, 2018 weird a longer arm and no spacer means more force on the arm don't it? longer the arm the more spacers would be needed I think Quote Link to comment
datzenmike Posted January 27, 2018 Report Share Posted January 27, 2018 If carburetor is on the paassenger side and exhaust on the driver's side then you have a Z series engine. Only the Z20 and the Z22 could have had a mechanical fuel pump. To ID this engine look between the two pair of exhaust pipes on top of block. It's stamped there just below the #2 and #3 spark plugs.... Quote Link to comment
Stoffregen Motorsports Posted January 27, 2018 Report Share Posted January 27, 2018 I figured it out. The new pump has a longer arm so i had to remove the spacer. I took off the cover and saw that it was making contact. The old pump leaked gas out by the arm. Yeah, that sounds backwards. If it has a longer arm and you took the spacer out, it would be making the problem worse. You can check pump operation by removing the valve cover and pumping the arm by hand, or with the pump unbolted from the head, again, with your hand. Sounds like you need to verify which engine you have too. 1 Quote Link to comment
racerx Posted January 27, 2018 Report Share Posted January 27, 2018 There's a reason why they have that plastic spacer. Don't take it out. 1 Quote Link to comment
datzenmike Posted January 27, 2018 Report Share Posted January 27, 2018 Plastic spacer and two gaskets to prevent engine heat conducting to the pump body. 1 Quote Link to comment
Flo1993 Posted January 27, 2018 Author Report Share Posted January 27, 2018 Well if I have the spacer on it the pump doesnt work when I bolt it on Quote Link to comment
Flo1993 Posted January 27, 2018 Author Report Share Posted January 27, 2018 So right now I have no spacer and i put 2 washers on each bolt Quote Link to comment
racerx Posted January 27, 2018 Report Share Posted January 27, 2018 Looks like napz engine u sure u got the right fuel pump. 1 Quote Link to comment
Flo1993 Posted January 27, 2018 Author Report Share Posted January 27, 2018 I was told this fuel pump is for a z20 so im assuming its the right pump Quote Link to comment
Flo1993 Posted January 27, 2018 Author Report Share Posted January 27, 2018 I cant see the engine ID because theres some grease on the flat spot so ill clean that off in a bit so i can just know what I have for sure. All I know is the guy I got it from said it was swapped and an auto parts guy told me its a z20 Quote Link to comment
datzenmike Posted January 27, 2018 Report Share Posted January 27, 2018 Z24s never had the mechanical fuel pumps. Could be an '81-'82 Z22 from a 720 but most likely a Z20 from a 510. 1 Quote Link to comment
racerx Posted January 27, 2018 Report Share Posted January 27, 2018 I cant see the engine ID because theres some grease on the flat spot so ill clean that off in a bit so i can just know what I have for sure. All I know is the guy I got it from said it was swapped and an auto parts guy told me its a z20...its better to make sure...the guy you got it from may or may not know until you check. What's that Russian saying "believe but verify". 1 Quote Link to comment
Flo1993 Posted January 27, 2018 Author Report Share Posted January 27, 2018 Ok so it's a z22 Quote Link to comment
datzenmike Posted January 27, 2018 Report Share Posted January 27, 2018 Never use Photobucket. Stop right now and switch to something that works. Now you know that you need a Z series fuel pump. 1 Quote Link to comment
bananahamuck Posted January 28, 2018 Report Share Posted January 28, 2018 Like Datzenmike said ,, use anything but PB as no-one can see your oics as posted So right now I have no spacer and i put 2 washers on each bolt Looks like there is a spacer in there to me ... Above quoted oic Quote Link to comment
Flo1993 Posted January 28, 2018 Author Report Share Posted January 28, 2018 That is the old pump before i replaced it What do you guys use for the pictures? Quote Link to comment
bananahamuck Posted January 28, 2018 Report Share Posted January 28, 2018 I use imgur but i only post from PC never from handheld. https://imgur.com/ 1 Quote Link to comment
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