Why is my fuel pressure high?

20

Asked by Jan 02, 2015 at 03:42 PM about the 1994 Chevrolet S-10 2 Dr LS Extended Cab SB

Question type: Maintenance & Repair

Pressure with engine off is 41 PSI but while running it jumps to 60 PSI. Volume test while running was also poor.

2 Answers

17,935

If it is a 4.3 it needs 55-65 psi to run. 41 while off indicates a weak regulator or fuel pump check valve

20

It's a 2.2. New engine, injectors, pump, filter, sensors.....basically this truck sat for 7 years and I've replaced almost everything under the hood. Blew out the fuel lines. Return line was clogged and blowing the FPR and causing fuel to flood the intake. Replaced the fuel cap today and it ran somewhat better. On the fuel test I ran, the pressure didn't drop until 20-30 mins later and dropped to 30PSI. I bought an evap canister filter and will change that out this Thursday when I'm off work. The only thing left I can think of is the actual fuel lines, or the pump I bought is faulty.

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

  • High oil pressure 1 answer

    106k miles immediately after replacing head 9yrs ago my pressure tops out when driving but goes to 60-75% when idling. The car runs fine, its only driven when other cars are being repaired so only...

    1994 Chevrolet S-10 2 Dr STD Standard Cab SB

    -

    Maintenance & Repair

  • Why does my transmission lose pressure and slip out of high gears, when ambient temperature is low 2 answers

    I have flushed the coolant system.. The heater core is stopped up and therefore I have bypassed the heater core. My water pump quits for a short time but then continues to work. I discovered my ca...

    2000 Chevrolet S-10

    -

    Maintenance & Repair

  • 98 s10 with 4.3 vortec wont start 18 answers

    my factory fuel pump went out i put a after market inline pump on but it wont start

    1998 Chevrolet S-10 2 Dr LS Extended Cab SB

    -

    Maintenance & Repair

  • S-10 Fuel Pump Help 1 answer

    My fuel pump went bad so I changed that out, rewired the pump ...Now need to re-connect the three lines that connect on top of the pump. How do I identify which line goes where on the pump? What do ...

    2000 Chevrolet S-10 2 Dr STD Extended Cab SB

    -

    Maintenance & Repair

  • Code # P2097 Replace High Pressure Fuel Pump only 70000 miles 2 answers

    Replace High Pressure fuel Pump

    2014 Chevrolet Malibu LT

    -

    Maintenance & Repair

Search Chevrolet S-10 Questions

Chevrolet S-10 Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 2,240
#2 John Saffrahn
John Saffrahn
Reputation 970
#3 Trebor66
Trebor66
Reputation 950
View All

Related Models For Sale

Used Ford Ranger
193 Great Deals out of 6,037 listings starting at $1,299
Used GMC Sonoma
7 Great Deals out of 490 listings starting at $2,995
Used Toyota Tacoma
486 Great Deals out of 39,057 listings starting at $2,900
Used Ford F-150
2,242 Great Deals out of 209,413 listings starting at $1,499
Used Dodge Dakota
106 Great Deals out of 3,870 listings starting at $1,295
Used Chevrolet Blazer
1,178 listings starting at $700
Used Dodge Ram 1500
432 Great Deals out of 11,327 listings starting at $1,000
Used GMC Sierra 1500
835 Great Deals out of 66,330 listings starting at $1,995
Used Chevrolet C/K 1500
917 listings starting at $2,500
Used Chevrolet Camaro
151 Great Deals out of 32,912 listings starting at $1,995
Used Ford Mustang
371 Great Deals out of 46,997 listings starting at $1,500